FORM 10-K
                    SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C.  20549
(Mark One)

[x]    Annual  report  pursuant to Section 13 or 15(d)  of  the  Securities
       Exchange Act of 1934 [Fee Required]

For the fiscal year ended December 31, 1997

                                    OR

[ ]    Transition  report pursuant to Section 13 or 15(d) of the Securities
       Exchange Act of 1934 [No Fee Required]

For the transition period from                      to

Commission File Number 0-19601

         Southwest Royalties Institutional Income Fund X-B, L.P.
                (Exact name of registrant as specified in
                    its limited partnership agreement)

Delaware                                                    75-2332174
(State or other jurisdiction                             (I.R.S. Employer
of incorporation or organization)                       Identification No.)

407 N. Big Spring, Suite 300, Midland, Texas                  79701
(Address of principal executive office)                     (Zip Code)

Registrant's telephone number, including area code  (915) 686-9927

       Securities registered pursuant to Section 12(b) of the Act:

                                   None

       Securities registered pursuant to Section 12(g) of the Act:

                      limited partnership interests

Indicate by check mark whether registrant (1) has filed reports required to
be  filed  by  Section 13 or 15(d) of the Securities Exchange Act  of  1934
during  the  preceding  12  months (or for such  shorter  period  that  the
registrant was required to file such reports), and (2) has been subject  to
such filing requirements for the past 90 days:     Yes   x    No

Indicate by check mark if disclosure of delinquent filers pursuant to  Item
405  of  Regulation S-K (229.405 of this chapter) is not contained  herein,
and  will  not  be  contained,  to the best of registrant's  knowledge,  in
definitive  proxy or information statements incorporated  by  reference  in
Part III of this Form 10-K or any amendment to this Form 10-K.     [x]

The  registrant's  outstanding  securities  consist  of  Units  of  limited
partnership  interests for which there exists no established public  market
from which to base a calculation of aggregate market value.

The  total  number of pages contained in this report is 44.   There  is  no
exhibit index.

<PAGE>
                            Table of Contents

Item                                                                   Page

                                  Part I

 1.  Business                                                            3

 2.  Properties                                                          7

 3.  Legal Proceedings                                                   9

 4.  Submission of Matters to a Vote of Security Holders                 9

                                 Part II

 5.  Market for Registrant's Common Equity and Related
     Stockholder Matters                                                10

 6.  Selected Financial Data                                            11

 7.  Management's Discussion and Analysis of
     Financial Condition and Results of Operations                      12

 8.  Financial Statements and Supplementary Data                        19

 9.  Changes in and Disagreements with Accountants
     on Accounting and Financial Disclosure                             36

                                 Part III

10.  Directors and Executive Officers of the Registrant                 37

11.  Executive Compensation                                             40

12.  Security Ownership of Certain Beneficial Owners and
     Management                                                         40

13.  Certain Relationships and Related Transactions                     42

                                 Part IV

14.  Exhibits, Financial Statement Schedules, and Reports
     on Form 8-K                                                        43

     Signatures                                                         44

<PAGE>
                                  Part I

Item 1.   Business

General
Southwest  Royalties Institutional Income Fund X-B, L.P. (the "Partnership"
or  "Registrant")  was  organized  as a  Delaware  limited  partnership  on
November  27,  1990.  The offering of limited partnership  interests  began
December  1,  1990 as part of a shelf offering registered  under  the  name
Southwest  Royalties Institutional 1990-91 Income Program (the  "Program").
Minimum  capital  requirements for the Partnership were met  on  March  11,
1991,  with  the  offering  of  limited  partnership  interests  concluding
September  30,  1991,  but  continuing for other  partnerships  within  the
program. The Partnership has no subsidiaries.

The Partnership has acquired interests in producing oil and gas properties,
and  produced and marketed the crude oil and natural gas produced from such
properties.  In most cases, the Partnership purchased royalty or overriding
royalty interests and working interests in oil and gas properties that were
converted into net profits interests or other nonoperating interests.   The
Partnership  purchased  either all or part of the  rights  and  obligations
under various oil and gas leases.

The  principal executive offices of the Partnership are located at  407  N.
Big Spring, Suite 300, Midland, Texas, 79701.  The Managing General Partner
of  the  Partnership,  Southwest Royalties,  Inc.  (the  "Managing  General
Partner")  and  its  staff  of  130  individuals,  together  with   certain
independent  consultants  used  on an "as needed"  basis,  perform  various
services on behalf of the Partnership, including the selection of  oil  and
gas properties and the marketing of production from such properties.  H. H.
Wommack,  III,  a  stockholder, director, President and  Treasurer  of  the
Managing  General Partner, is also a general partner.  The Partnership  has
no employees.

Principal Products, Marketing and Distribution
The  Partnership has acquired and holds royalty, overriding royalty and net
profit  interests  in oil and gas properties located in Arkansas,  Florida,
Louisiana, Mississippi, New Mexico, Oklahoma and Texas.  All activities  of
the Partnership are confined to the continental United States.  All oil and
gas  produced from these properties is sold to unrelated third  parties  in
the oil and gas business.

The  revenues  generated from the Partnership's oil and gas activities  are
dependent upon the current market for oil and gas.  The prices received  by
the Partnership for its oil and gas production depend upon numerous factors
beyond   the   Partnership's  control,  including  competition,   economic,
political  and regulatory developments and competitive energy sources,  and
make it particularly difficult to estimate future prices of oil and natural
gas.

<PAGE>
1997  was  another volatile year in the oil market.  Prices ranged  from  a
high  of  approximately $26 in the first quarter to  a  low  near  $18  per
barrel.   Two contributing factors that influence the oil industry are  the
strength  of the economy and activity in the Middle East.  Both  influenced
the  supply  and demand of oil, and both played roles in price swings  this
year.   Economic  expansion  throughout the world  enabled  consumption  to
surpass  70  million barrels of oil per day.  However, early in  the  year,
producing  countries failed to make up the difference  in  supply,  placing
upward  pressure  on  prices.  U.S. production fell  slightly  in  1997  to
average  roughly 6.4 million barrels of oil per day.  Over the Thanksgiving
weekend,  OPEC  agreed  to increase their crude oil production  ceiling  by
approximately  10%,  but experts have said that many  OPEC  countries  were
already  producing beyond their quotas, therefore, capacity is not expected
to expand severely.  Then on December 4th, the UN Security Council approved
a  renewal of the Iraqi oil-for-food program.  The OPEC agreement  and  the
UN's decision on the oil-for-food program will certainly increase the world
supply  of  oil and most likely depress prices in the near term.   However,
world demand is expected to continue with strong growth in 1998.

The  December  31, 1997 NYMEX oil price of $17.64 dropped to $14.32  as  of
March 18, 1998.  The price decline in the first quarter of 1998 could cause
a material write down in oil and gas properties and a possible reduction in
future distributions to investors.

Overall the 1997 average price of natural gas increased nationwide from the
1996  rates.  In some areas the increase was as high as 15%.  The 1996  and
1997  average prices are by far the highest realized by the industry  since
1985.   The  1998 average price is expected to remain above the  $2.00  per
MMBTU  level,  however some early signs indicate that the  prices  will  be
softer in 1998 than they were in 1997.  Forecasts for a mild winter and the
lack  of gas storage withdrawals are fueling speculation that the U.S.  has
an  excess  supply of gas thus driving the prices down to  the  early  1996
levels.


Following  is a table of the ratios of revenues received from oil  and  gas
production for the last three years:

                                  Oil          Gas

                    1997          78%          22%
                    1996          80%          20%
                    1995          83%          17%

As  the table indicates, the majority of the Partnership's revenue is  from
its   oil  production;  therefore,  Partnership  revenues  will  be  highly
dependent upon the future prices and demands for oil.

Seasonality of Business
Although the demand for natural gas is highly seasonal, with higher  demand
in  the colder winter months and in very hot summer months, the Partnership
has  been able to sell all of its natural gas, either through contracts  in
place or on the spot market at the then prevailing spot market price.  As a
result,  the volumes sold by the Partnership have not fluctuated materially
with the change of season.

<PAGE>
Customer Dependence
No  material portion of the Partnership's business is dependent on a single
purchaser,  or a very few purchasers, where the loss of one  would  have  a
material adverse impact on the Partnership.  Three purchasers accounted for
62%  of the Partnership's total oil and gas production during 1997:   Mobil
Corporation  31%, Scurlock Permian Corporation  17% and Marathon  Petroleum
Company   14%.   Three  purchasers accounted for 60% of  the  Partnership's
total  oil and gas production during 1996:  Mobil Corporation 33%, Scurlock
Permian  Corporation  15%  and  Marathon  Petroleum  Company  12%.    Three
purchasers  accounted  for  55%  of the Partnership's  total  oil  and  gas
production  during  1995:  Mobil Corporation, Scurlock Permian  Corporation
and  Marathon  Petroleum Company purchased 32%, 13% and 10%,  respectively.
All  purchasers of the Partnership's oil and gas production  are  unrelated
third  parties.   In the event any of these purchasers were to  discontinue
purchasing  the  Partnership's  production, the  Managing  General  Partner
believes that a substitute purchaser or purchasers could be located without
undue  delay.   No  other purchaser accounted for an  amount  equal  to  or
greater than 10% of the Partnership's sales of oil and gas production.

Competition
Because  the  Partnership has utilized all of its funds available  for  the
acquisition  of net profits or royalty interests in producing oil  and  gas
properties,  it  is  not  subject to competition from  other  oil  and  gas
property purchasers.  See Item 2, Properties.

Factors  that  may  adversely  affect the  Partnership  include  delays  in
completing  arrangements  for  the sale of production,  availability  of  a
market for production, rising operating costs of producing oil and gas  and
complying  with  applicable  water  and  air  pollution  control  statutes,
increasing  costs  and  difficulties of transportation,  and  marketing  of
competitive  fuels.   Moreover, domestic oil  and  gas  must  compete  with
imported oil and gas and with coal, atomic energy, hydroelectric power  and
other forms of energy.

Regulation

Oil  and Gas Production - The production and sale of oil and gas is subject
to  federal and state governmental regulation in several respects, such  as
existing price controls on natural gas and possible price controls on crude
oil,  regulation of oil and gas production by state and local  governmental
agencies, pollution and environmental controls and various other direct and
indirect   regulation.    Many  jurisdictions  have  periodically   imposed
limitations on oil and gas production by restricting the rate of  flow  for
oil  and  gas wells below their actual capacity to produce and by  imposing
acreage limitations for the drilling of wells.  The federal government  has
the  power  to  permit increases in the amount of oil imported  from  other
countries and to impose pollution control measures.

<PAGE>
Various  aspects of the Partnership's oil and gas activities are  regulated
by  administrative agencies under statutory provisions of the states  where
such  activities  are  conducted and by certain  agencies  of  the  federal
government for operations on Federal leases.  Moreover, certain  prices  at
which the Partnership may sell its natural gas production are controlled by
the  Natural Gas Policy Act of 1978, the Natural Gas Wellhead Decontrol Act
of  1989  and the regulations promulgated by the Federal Energy  Regulatory
Commission.

Environmental  - The Partnership's oil and gas activities  are  subject  to
extensive  federal,  state  and local laws and  regulations  governing  the
generation,  storage, handling, emission, transportation and  discharge  of
materials into the environment.  Governmental authorities have the power to
enforce compliance with their regulations, and violations carry substantial
penalties.   This  regulatory burden on the oil and gas industry  increases
its cost of doing business and consequently affects its profitability.  The
Managing  General  Partner  is  unable to  predict  what,  if  any,  effect
compliance will have on the Partnership.

Industry  Regulations  and  Guidelines - Certain industry  regulations  and
guidelines  apply to the registration, qualification and operation  of  oil
and  gas programs in the form of limited partnerships.  The Partnership  is
subject  to  these  guidelines  which regulate  and  restrict  transactions
between the Managing General Partner and the Partnership.

The  Partnership  complies with these guidelines and the  Managing  General
Partner  does not anticipate that continued compliance will have a material
adverse effect on Partnership operations.

Partnership Employees
The  Partnership has no employees; however the Managing General Partner has
a  staff of geologists, engineers, accountants, landmen and clerical  staff
who  engage in Partnership activities and operations and perform additional
services  for  the  Partnership as needed.  In  addition  to  the  Managing
General  Partner's  staff, the Partnership engages independent  consultants
such  as petroleum engineers and geologists as needed.  As of December  31,
1997,  there were 130 individuals directly employed by the Managing General
Partner in various capacities.

<PAGE>
Item 2.   Properties

In  determining whether an interest in a particular producing property  was
to  be  acquired, the Managing General Partner considered such criteria  as
estimated  oil  and  gas reserves, estimated cash flow  from  the  sale  of
production,  present  and  future prices of oil  and  gas,  the  extent  of
undeveloped  and  unproved reserves, the potential for secondary,  tertiary
and other enhanced recovery projects and the availability of markets.

As  of December 31, 1997, the Partnership possessed an interest in oil  and
gas properties located in Columbia County of Arkansas; Santa Rosa County of
Florida;  Cameron and Calcasieu Parishes of Louisiana; Walthall  County  of
Mississippi;  Beckham,  Garvin,  Grady, Harper  and  Stephens  Counties  of
Oklahoma;  Eddy  and  Lea  Counties of New  Mexico;  and  Andrews,  Borden,
Colorado,  Crane, Crockett, Duval, Ector, Gaines, Howard, Martin,  Midland,
Nacogdoches,  Panola, Reeves, Schleicher, Scurry, Sterling, Sutton,  Upton,
Ward,  Winkler and Yoakum Counties of Texas.  These properties  consist  of
various interests in approximately 291 wells and units.

Due  to  the  Partnership's  objective of  maintaining  current  operations
without engaging in the drilling of any developmental or exploratory wells,
or additional acquisitions of producing properties, there have not been any
significant changes in properties during 1997, 1996 and 1995.

Upon a determination by Management that they were either not profitable  to
own  or Management received an offer that exceeded the leases reserves, the
following leases were sold.

During  1997,  one  lease was sold for approximately $38,500.   The  Gaines
Wesson Clearfork was sold effective June 1997.

During  1996,  four leases were sold for approximately $227,100.   The  Jay
Little Escambia Creek was sold effective July 1995, Todd was sold effective
March 1996 and Fair-Wendt and CW Hahl were sold effective December 1996.

During 1995, nine leases were sold for approximately $271,700.  The Kloh  D
was  sold  effective  September 1995, the Robinson  E  was  sold  effective
October  1995  and  the Percy Jones, Percy Jones B, Ares State,  B.  Davis,
State 157-G, McGee Heirs #1 and Grayburg were sold effective November 1995.


<PAGE>
Significant Properties
The  following  table  reflects the significant  properties  in  which  the
Partnership has an interest:

                          Date
                       Purchased        No. of          Proved Reserves*
Name and Location     and Interest      Wells        Oil (bbls)  Gas (mcf)
-----------------     ------------      -----        ----------  ---------

Freer Acquisition     9/91 at .2%        26        159,927        219,208
Duval County,         to 43.5% net
Texas                 profits interest

NE Vacuum ABO         9/91 at 25%        10         81,484         68,955
Acquisition           to 50% net
Lea County,           profits interest
New Mexico

TXL Beach             3/92 at 37.5%       7         75,310              -
Acquisition,          to 50% net
Sterling County,      profits interest
Texas

*The  reserve estimates were prepared as of January 1, 1998, by  Donald  R.
Creamer,  P.E., an independent registered petroleum engineer.  The  reserve
estimates  were  made  in  accordance with guidelines  established  by  the
Securities and Exchange Commission pursuant to Rule 4-10(a) of Regulation S-
X.   Such guidelines require oil and gas reserve reports be prepared  under
existing economic and operating conditions with no provisions for price and
cost escalation except by contractual arrangements.

The  New York Mercantile Exchange price at December 31, 1997 of $17.64  was
used  as the beginning basis for the oil price.  Oil price adjustments from
$17.64  per  barrel were made in the individual evaluations to reflect  oil
quality,  gathering and transportation costs.  The results are  an  average
price received at the lease of $16.88 per barrel in the preparation of  the
reserve report as of January 1, 1998.

In  the  determination of the gas price, the New York  Mercantile  Exchange
price  at December 31, 1997 of $2.26 was used as the beginning basis.   Gas
price   adjustments  from  $2.26  per  Mcf  were  made  in  the  individual
evaluations to reflect BTU content, gathering and transportation costs  and
gas processing and shrinkage.  The results are an average price received at
the  lease of $2.25 per Mcf in the preparation of the reserve report as  of
January 1, 1998.

<PAGE>
As  also discussed in Part II, Item 7, Management's Discussion and Analysis
of  Financial Condition and Results of Operations, oil and gas prices  were
subject to frequent changes in 1997.

The  evaluation  of  oil and gas properties is not  an  exact  science  and
inevitably involves a significant degree of uncertainty, particularly  with
respect to the quantity of oil or gas that any given property is capable of
producing.   Estimates  of  oil and gas reserves  are  based  on  available
geological and engineering data, the extent and quality of which  may  vary
in  each  case  and,  in  certain instances, may prove  to  be  inaccurate.
Consequently,  properties may be depleted more rapidly than the  geological
and engineering data have indicated.

Unanticipated  depletion, if it occurs, will result in lower reserves  than
previously  estimated; thus an ultimately lower return for the Partnership.
Basic  changes in past reserve estimates occur annually.  As  new  data  is
gathered  during the subsequent year, the engineer must revise his  earlier
estimates.  A year of new information, which is pertinent to the estimation
of  future  recoverable volumes, is available during  the  subsequent  year
evaluation.   In applying the industry audit standards and procedures,  the
new data may cause the previous estimates to be revised.  This revision may
increase  or decrease the earlier estimated volumes.  Pertinent information
gathered  during the year may include actual production and decline  rates,
production  from  offset  wells  drilled to the  same  geologic  formation,
increased or decreased water production, workovers, and changes in  lifting
costs,  among  others.  Accordingly, reserve estimates are often  different
from the quantities of oil and gas that are ultimately recovered.

The  Partnership  has  reserves which are classified  as  proved  developed
producing, proved developed non-producing and proved undeveloped.   All  of
the  proved reserves are included in the engineering reports which evaluate
the Partnership's present reserves.

Because  the  Partnership  does  not engage  in  drilling  activities,  the
development of proved undeveloped reserves is conducted pursuant  to  farm-
out  arrangements  with  the Managing General Partner  or  unrelated  third
parties.  Generally, the Partnership retains a carried interest such as  an
overriding  royalty  interest under the terms of a  farm-out,  or  receives
cash.  The Partnership or the owners of properties in which the Partnership
owns  an interest can engage in workover projects or supplementary recovery
projects, for example, to extract behind the pipe reserves which qualify as
proved developed non-producing reserves.  See Part II, Item 7, Management's
Discussion and Analysis of Financial Condition and Results of Operations.

Item 3.   Legal Proceedings

There are no material pending legal proceedings to which the Partnership is
a party.

Item 4.   Submission of Matters to a Vote of Security Holders

No  matter  was submitted to a vote of security holders during  the  fourth
quarter of 1997 through the solicitation of proxies or otherwise.

<PAGE>
                                 Part II


Item 5.   Market for the Registrant's Common Equity and Related Stockholder
          Matters

Market Information
Limited  partnership interests, or units, in the Partnership were initially
offered and sold for a price of $500.  Limited partner units are not traded
on  any  exchange  and there is no public or organized trading  market  for
them.  The Managing General Partner has become aware of certain limited and
sporadic transfers of units between limited partners and third parties, but
has no verifiable information regarding the prices at which such units have
been  transferred.   Further,  a transferee may  not  become  a  substitute
limited partner without the consent of the Managing General Partner.

Managing General Partner has the right, but not the obligation, to purchase
limited partnership units should an investor desire to sell.  The value  of
the  unit  is  determined   by adding the sum of (1)  current  assets  less
liabilities  and  (2)  the  present  value  of  the  future  net   revenues
attributable to proved reserves and by discounting the future net  revenues
at  a rate not in excess of the prime rate charged by NationsBank, N.A.  of
Midland, Texas plus one percent (1%), which value shall be further  reduced
by  a risk factor discount of no more than one-third (1/3) to be determined
by  the  Managing General Partner in its sole and absolute discretion.   In
1997,  81  limited  partner units were tendered to  and  purchased  by  the
Managing General Partner at an average base price of $161.82 per unit.   In
1996,  208  limited  partner units were tendered to and  purchased  by  the
Managing General Partner at an average base price of $207.91 per unit.   As
of  December  31,  1995,  no limited partner units were  purchased  by  the
Managing General Partner.

Number of Limited Partner Interest Holders
As of December 31, 1997, there were 612 holders of limited partner units in
the Partnership.

Distributions
Pursuant to Article III, Section 3.05 of the Partnership's Certificate  and
Agreement  of  Limited Partnership "Net Cash Flow" is  distributed  to  the
partners  on  a  monthly basis.  "Net Cash Flow" is defined  as  "the  cash
generated  by  the  Partnership's investments  in  producing  oil  and  gas
properties,  less  (i)  General and Administrative  Costs,  (ii)  Operating
Costs,  and  (iii) any reserves necessary to meet current  and  anticipated
needs  of  the  Partnership, as determined in the sole  discretion  of  the
Managing General Partner."

<PAGE>
During 1997, twelve monthly distributions were made totaling $607,058, with
$549,958  distributed to the limited partners and $57,100  to  the  general
partners.   For the year ended December 31, 1997, distributions  of  $49.19
per limited partner unit were made, based upon 11,181 limited partner units
outstanding.  During 1996, twelve monthly distributions were made  totaling
$846,613, with $769,213 distributed to the limited partners and $77,400  to
the  general partners.  For the year ended December 31, 1996, distributions
of  $68.80  per  limited partner unit were made, based upon 11,181  limited
partner units outstanding.  During 1995, twelve monthly distributions  were
made  totaling $553,400, with $509,000 distributed to the limited  partners
and $44,400 to the general partners.  For the year ended December 31, 1995,
distributions of $45.52 per limited partner unit were made, based on 11,181
limited partner units outstanding.

Item 6.   Selected Financial Data

The  following  selected financial data for the years  ended  December  31,
1997,  1996,  1995,  1994 and 1993 should be read in conjunction  with  the
financial statements included in Item 8:

                                   Years ended December 31,
                 -----------------------------------------------------------
                      1997       1996       1995      1994          1993
                      ----       ----       ----      ----          ----
Revenues        $   534,989    608,727    574,832    566,263      922,576

Net income
 (loss)             256,108    388,231    285,783    172,677    (589,083)

Partners' share
 of net income
  (loss):

  General
   partners          45,411     52,720     49,078     47,768       82,589

  Limited
   partners         210,697    335,511    236,705    124,909    (671,672)

Limited partners'
 net income (loss)
  per unit            18.84      30.01      21.17      11.17      (60.07)

Limited partners'
 cash distributions
  per unit            49.19      68.80      45.52      46.18        71.58

Total assets    $ 1,493,285  1,844,235  2,302,625  2,570,909    2,965,768

<PAGE>
Item 7.   Management's  Discussion and Analysis of Financial Condition  and
          Results of Operations

General
The  Partnership was formed to acquire nonoperating interests in  producing
oil  and  gas  properties, to produce and market crude oil and natural  gas
produced  from  such  properties and to distribute any  net  proceeds  from
operations  to  the  general  and  limited  partners.   Net  revenues  from
producing  oil  and  gas  properties are not reinvested  in  other  revenue
producing  assets except to the extent that producing facilities and  wells
are  reworked  or  where  methods are employed to improve  or  enable  more
efficient  recovery  of oil and gas reserves.  The  economic  life  of  the
Partnership thus depends on the period over which the Partnership's oil and
gas reserves are economically recoverable.

Increases   or   decreases   in  Partnership   revenues   and,   therefore,
distributions  to partners will depend primarily on changes in  the  prices
received  for  production,  changes in volumes of  production  sold,  lease
operating  expenses, enhanced recovery projects, offset drilling activities
pursuant  to  farm-out arrangements and on the depletion of  wells.   Since
wells  deplete over time, production can generally be expected  to  decline
from year to year.

Well  operating costs and general and administrative costs usually decrease
with   production   declines;  however,  these  costs  may   not   decrease
proportionately.   Net  income available for distribution  to  the  limited
partners  is therefore expected to fluctuate in later years based on  these
factors.

Based  on  current conditions, management anticipates performing  workovers
during  the  next  few years to enhance production.  The Partnership  could
possibly  experience the following changes; a slight increase in  1998  and
1999, leveling off in 2000 and beginning a decline in 2001.


<PAGE>
Results of Operations

A.  General Comparison of the Years Ended December 31, 1997 and 1996

The  following  table  provides certain information  regarding  performance
factors for the years ended December 31, 1997 and 1996:

                                                  Year Ended     Percentage
                                                 December 31,     Increase
                                                1997      1996   (Decrease)
                                                ----      ----   ---------

Average price per barrel of oil            $   18.74    20.01     (6%)
Average price per mcf of gas               $    2.31     2.13       8%
Oil production in barrels                     53,100   59,200    (10%)
Gas production in mcf                        119,300  135,500    (12%)
Income from net profits interests          $ 530,113  603,894    (12%)
Partnership distributions                  $ 607,058  846,613    (29%)
Limited partner distributions              $ 549,958  769,213    (29%)
Per unit distribution to limited partners  $   49.19    68.80    (29%)
Number of limited partner units               11,181   11,181

Revenues

The  Partnership's income from net profits interests decreased to  $530,113
from $603,894 for the years ended December 31, 1997 and 1996, respectively,
a  decrease of 12%.  The principal factors affecting the comparison of  the
years ended December 31, 1997 and 1996 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the year ended December 31, 1997 as compared  to  the
    year ended December 31, 1996 by 6%, or $1.27 per barrel, resulting in a
    decrease of approximately $75,200 in income from net profits interests.
    Oil  sales represented 78% of total oil and gas sales during  the  year
    ended  December  31,  1997 as compared to 80% during  the  year   ended
    December 31, 1996.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased  during the same period by 8%, or $.18 per mcf, resulting  in
    an  increase  of  approximately $24,400  in  income  from  net  profits
    interests.

    The  net total decrease in income from net profits interests due to the
    change  in prices received from oil and gas production is approximately
    $50,800 .  The market price for oil and gas has been extremely volatile
    over  the  past  decade  and management expects  a  certain  amount  of
    volatility to continue in the foreseeable future.

<PAGE>

2.  Oil  production decreased approximately 6,100 barrels or 10% during the
    year ended December 31, 1997 as compared to the year ended December 31,
    1996, resulting in a decrease of approximately $114,300 in income  from
    net profits interests.

    Gas  production  decreased approximately 16,200 mcf or 12%  during  the
    same period, resulting in a decrease of approximately $37,400 in income
    from net profits interests.

    The  total  decrease in income from net profits interests  due  to  the
    change in production is approximately $151,700.

3.  Lease  operating  costs  and  production  taxes  were  14%  lower,   or
    approximately $125,700 less during the year ended December 31, 1997  as
    compared to the year ended December 31, 1996.

Costs and Expenses

Total  costs and expenses increased to $278,881 from $220,496 for the years
ended  December 31, 1997 and 1996, respectively, an increase of  26%.   The
increase  is  the  result of higher depletion expense partially  offset  by
general and administrative expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 1%
    or  approximately  $600  during the year ended  December  31,  1997  as
    compared to the year ended December 31, 1996.

2.    Depletion  expense increased to $198,000 for the year ended  December
   31, 1997 from $137,000 for the same period in 1996.  This represents  an
   increase of 45%.  Depletion is calculated using the units of revenue method
   of amortization based on a percentage of current period gross revenues to
   total future gross oil and gas revenues, as estimated by the Partnership's
   independent petroleum consultants.

    A  contributing factor to the increase in depletion expense between the
    comparative periods was the decrease in the price of oil and  gas  used
    to determine the Partnership's reserves for January 1, 1998 as compared
    to  1997.   Another  contributing factor  was  due  to  the  impact  of
    revisions  of  previous estimates on reserves.  Revisions  of  previous
    estimates  can be attributed to the changes in production  performance,
    oil  and  gas  price and production costs.  The impact of the  revision
    would  have  increased depletion expense approximately  $66,000  as  of
    December 31, 1996.

<PAGE>

Results of Operations

B.  General Comparison of the Years Ended December 31, 1996 and 1995

The  following  table  provides certain information  regarding  performance
factors for the years ended December 31, 1996 and 1995:

                                                 Year Ended      Percentage
                                                December 31,      Increase
                                               1996      1995    (Decrease)
                                               ----      ----    ----------
Average price per barrel of oil          $    20.01     16.54      21%
Average price per mcf of gas             $     2.13      1.48      44%
Oil production in barrels                    59,200    76,400    (23%)
Gas production in mcf                       135,500   177,400    (24%)
Income from net profits interests        $  603,894   571,313       6%
Partnership distributions                $  846,613   553,400      53%
Limited partner distributions            $  769,213   509,000      51%
Per unit distribution to limited
 partners                                $    68.80     45.52      51%
Number of limited partner units              11,181    11,181

Revenues

The  Partnership's income from net profits interests increased to  $603,894
from $571,313 for the years ended December 31, 1996 and 1995, respectively,
an  increase of 6%.  The principal factors affecting the comparison of  the
years ended December 31, 1996 and 1995 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    increased  during the year ended December 31, 1996 as compared  to  the
    year ended December 31, 1995 by 21%, or $3.47 per barrel, resulting  in
    an  increase  of  approximately $265,100 in  income  from  net  profits
    interests.  Oil sales represented 80% of total oil and gas sales during
    the  year  ended December 31, 1996 as compared to 83% during  the  year
    ended December 31, 1995.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased during the same period by 44%, or $.65 per mcf, resulting  in
    an  increase  of  approximately $115,300 in  income  from  net  profits
    interests.

    The  total  increase in income from net profits interests  due  to  the
    change  in prices received from oil and gas production is approximately
    $380,400.  The market price for oil and gas has been extremely volatile
    over  the  past  decade, and management expects  a  certain  amount  of
    volatility to continue in the foreseeable future.

<PAGE>
2.  Oil production decreased approximately 17,200 barrels or 23% during the
    year ended December 31, 1996 as compared to the year ended December 31,
    1995, resulting in a decrease of approximately $344,200 in income  from
    net profits interests.

    Gas  production  decreased approximately 41,900 mcf or 24%  during  the
    same period, resulting in a decrease of approximately $89,200 in income
    from net profits interests.

    The  total  decrease in income from net profits interests  due  to  the
    change  in  production  is  approximately $433,400.   The  decrease  is
    primarily a result of property sales.

3.  Lease   operating  costs  and  production  taxes  were  9%  lower,   or
    approximately $86,300 less during the year ended December 31,  1996  as
    compared to the year ended December 31, 1995.

Costs and Expenses

Total  costs and expenses decreased to $220,496 from $289,049 for the years
ended  December 31, 1996 and 1995, respectively, a decrease  of  24%.   The
decrease  is  the  result of lower general and administrative  expense  and
depletion expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 3%
    or  approximately  $2,500 during the year ended December  31,  1996  as
    compared to the year ended December 31, 1995.

2.  Depletion expense decreased to $137,000 for the year ended December 31,
    1996  from  $196,000 for the same period in 1995.   This  represents  a
    decrease  of 30%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the Partnership's independent petroleum consultants.

    A  contributing factor to the decline in depletion expense between  the
    comparative periods was the increase in the price of oil and  gas  used
    to determine the Partnership's reserves for January 1, 1997 as compared
    to  1996.   Another  contributing factor  was  due  to  the  impact  of
    revisions  of  previous estimates on reserves.  Revisions  of  previous
    estimates  can be attributed to the changes in production  performance,
    oil  and  gas  price and production costs.  The impact of the  revision
    would  have  decreased depletion expense approximately  $23,000  as  of
    December 31, 1995.

<PAGE>

C.  Revenue and Distribution Comparison

Partnership net income for the years ended December 31, 1997, 1996 and 1995
was $256,108 $388,231 and $285,783, respectively.  Excluding the effects of
depreciation,  depletion  and amortization,  net  income  would  have  been
$454,108  in 1997, $527,197 in 1996 and $490,783 in 1995.  Correspondingly,
Partnership distributions for the years ended December 31, 1997,  1996  and
1995 were $607,058, $846,613 and $553,400, respectively.  These differences
are  indicative  of  the  changes in oil and  gas  prices,  production  and
property sales.

The  sources  for  the  1997 distributions of $607,058  were  oil  and  gas
operations  of  approximately  $501,600 and  the  change  in  oil  and  gas
properties  of approximately $95,900, with the balance from available  cash
on  hand  at  the  beginning  of the period.   The  sources  for  the  1996
distributions  of  $846,613  were oil and gas operations  of  approximately
$494,100  and  property sales of approximately $127,200, with  the  balance
from  available cash on hand at the beginning of the period.   The  sources
for  the  1995  distributions of $553,400 were oil and  gas  operations  of
approximately  $502,200  and  property  sales  of  approximately  $271,700,
resulting in excess cash for contingencies or subsequent distributions.

Total  distributions during the year ended December 31, 1997 were  $607,058
of  which  $549,958 was distributed to the limited partners and $57,100  to
the general partners.  The per unit distribution to limited partners during
the  same  period was $49.19.  Total distributions during  the  year  ended
December  31, 1996 were $846,613 of which $769,213 was distributed  to  the
limited  partners  and  $77,400  to the  general  partners.  The  per  unit
distribution to limited partners during the same period was $68.80.   Total
distributions  during  the year ended December 31, 1995  were  $553,400  of
which  $509,000 was distributed to the limited partners and $44,400 to  the
general partners.  The per unit distribution to limited partners during the
same period was $45.52.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $4,474,029  have been made to the partners.  As of December  31,  1997,
$4,073,916 or $364.36 per limited partner unit, has been distributed to the
limited partners, representing a 73% return of the capital contributed.

<PAGE>
Liquidity and Capital Resources

The  primary source of cash is from operations,  the receipt of income from
net profits interests in oil and gas properties.  The Partnership knows  of
no material change, nor does it anticipate any such change.

The  December  31, 1997 NYMEX oil price of $17.64 dropped to $14.32  as  of
March 18, 1998.  The price decline in the first quarter of 1998 could cause
a material write down in oil and gas properties and a possible reduction in
future distributions to investors.

Cash flows provided by operating activities were approximately $501,600  in
1997 compared to $494,100 in 1996 and approximately $502,200 in 1995.   The
primary  source  of  the  1997  cash flow  from  operating  activities  was
profitable operations.

Cash  flows provided by investing activities were approximately $95,900  in
1997 compared to $127,200 in 1996 and approximately $271,700 in 1995.   The
principal source of the 1997 cash flow from investing activities  was  from
the sale of oil and gas properties.

Cash flows used in financing activities were approximately $607,100 in 1997
compared to $846,600 in 1996 and approximately $553,400 in 1995.  The  only
use in financing activities was the distributions to partners.

As  of  December  31, 1997, the Partnership had approximately  $135,900  in
working  capital.   The  Managing  General  Partner  knows  of  no  unusual
contractual  commitments and believes the revenue generated from  operation
are adequate to meet the needs of the Partnership.

Information Systems for the Year 2000

The  Managing  General Partner provides all data processing  needs  of  the
Partnership.   The Managing General Partner has reviewed and evaluated  its
information  systems  to determine if its systems accurately  process  data
referencing   the   year   2000.   Primarily  all   necessary   programming
modifications  to  correct year 2000 referencing in  the  Managing  General
Partners  internal accounting and operating systems have been made to-date.
However  the  Managing General Partner has not completed its evaluation  of
its vendors and suppliers systems to determine the effect, if any, the non-
compliance  of  such systems would have on the operation  of  the  Managing
General Partnership or the operations of the Partnership.


<PAGE>
Item 8.        Financial Statements and Supplementary Data

                      Index to Financial Statements

                                                                       Page

Independent Auditors Reports                                            20

Balance Sheets                                                          22

Statements of Operations                                                23

Statement of Changes in Partners' Equity                                24

Statements of Cash Flows                                                25

Notes to Financial Statements                                           27

<PAGE>









                        INDEPENDENT AUDITORS REPORT
                                     
The Partners
Southwest Royalties Institutional
 Income Fund X-B, L.P.
 (A Delaware Limited Partnership):


We  have  audited  the  accompanying balance sheet of  Southwest  Royalties
Institutional Income Fund X-B, L.P. (the "Partnership") as of December  31,
1997,  and the related statement of operations, changes in partners' equity
and cash flows for the year then ended.  These financial statements are the
responsibility of the Partnership's management.  Our responsibility  is  to
express an opinion on these financial statements based on our audit.

We  conducted  our  audit  in accordance with generally  accepted  auditing
standards.  Those standards require that we plan and perform the  audit  to
obtain reasonable assurance about whether the financial statements are free
of  material  misstatement.  An audit includes examining, on a test  basis,
evidence   supporting  the  amounts  and  disclosures  in   the   financial
statements.   An  audit  also includes assessing the accounting  principles
used  and  significant estimates made by management, as well as  evaluating
the  overall financial statement presentation.  We believe that  our  audit
provides reasonable basis for our opinion.

In  our opinion, the financial statements referred to above present fairly,
in  all  material  respects, the financial position of Southwest  Royalties
Institutional Income Fund X-B, L.P. as of December 31, 1997 and the results
of  its operations and its cash flows for the year then ended in conformity
with generally accepted accounting principles.



                        KPMG Peat Marwick LLP



Midland, Texas
March 18, 1998

<PAGE>









                    REPORT OF INDEPENDENT ACCOUNTANTS


To the Partners
Southwest Royalties Institutional
 Income Fund X-B, L.P.
Midland, Texas

We  have  audited  the  accompanying balance sheet of  Southwest  Royalties
Institutional Income Fund X-B, L.P. as of December 31, 1996 and the related
statements  of operations, changes in partners' equity and cash  flows  for
the years ended December 31, 1996 and 1995.  These financial statements are
the responsibility of the partnership's management.  Our responsibility  is
to express an opinion on these financial statements based on our audits.

We  conducted  our  audits in accordance with generally  accepted  auditing
standards.  Those standards require that we plan and perform the  audit  to
obtain reasonable assurance about whether the financial statements are free
of  material  misstatement.  An audit includes examining, on a test  basis,
evidence   supporting  the  amounts  and  disclosures  in   the   financial
statements.   An  audit  also includes assessing the accounting  principles
used  and  significant estimates made by management, as well as  evaluating
the  overall financial statement presentation.  We believe that our  audits
provide a reasonable basis for our opinion.

In  our opinion, the financial statements referred to above present fairly,
in  all  material  respects, the financial position of Southwest  Royalties
Institutional Income Fund X-B, L.P. as of December 31, 1996 and the results
of  its operations and its cash flows for the years ended December 31, 1996
and 1995, in conformity with generally accepted accounting principles.


                        JOSEPH DECOSIMO AND COMPANY
                           A   Tennessee   Registered   Limited   Liability
Partnership


Chattanooga, Tennessee
March 14, 1997

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)
                              Balance Sheets
                        December 31, 1997 and 1996


                                                      1997          1996
                                                      ----          ----

  Assets

Current assets:
 Cash and cash equivalents                   $         7,101       16,680
 Receivable from Managing General Partner             90,302      137,799
 Other receivable                                     38,500      100,000

---------                                    ---------
                                                 Total    current    assets
135,903                                      254,479

---------                                    ---------
Oil and gas properties - using the full-
 cost method of accounting                         4,210,473    4,244,847
  Less accumulated depreciation,
                                               depletion  and  amortization
2,853,091                                    2,655,091

---------                                    ---------
                                              Net  oil  and gas  properties
1,357,382                                    1,589,756

---------                                    ---------
                                                                          $
1,493,285                                    1,844,235

=========                                    =========

  Liabilities and Partners' Equity

Partners' equity:
 General partners                                   (18,122)      (6,433)
 Limited partners                                  1,511,407    1,850,668

---------                                    ---------
                                                Total    partners'   equity
1,493,285                                    1,844,235

---------                                    ---------
                                                                          $
1,493,285                                    1,844,235

=========                                    =========























                  The accompanying notes are an integral
                   part of these financial statements.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)
                         Statements of Operations
               Years ended December 31, 1997, 1996 and 1995


                                                 1997      1996      1995
                                                 ----      ----      ----

  Revenues

Income from net profits interests         $    530,113   603,894  571,313
Interest from operations                         4,876     4,833    3,519
                                                                    -------
-------                                   -------
                                                                    534,989
608,727                                   574,832
                                                                    -------
-------                                   -------
  Expenses

General and administrative                      80,881    81,530   84,049
Depreciation, depletion and amortization       198,000   138,966  205,000
                                                                    -------
-------                                   -------
                                                                    278,881
220,496                                   289,049
                                                                    -------
-------                                   -------
Net income                                $    256,108   388,231  285,783
                                                                    =======
=======                                   =======
Net income allocated to:

 Managing General Partner                 $     40,870    47,448   44,170
                                                                    =======
=======                                   =======
 General Partner                          $      4,541     5,272    4,908
                                                                    =======
=======                                   =======
 Limited partners                         $    210,697   335,511  236,705
                                                                    =======
=======                                   =======
  Per limited partner unit                $      18.84     30.01    21.17
                                                                    =======
=======                                   =======


























                  The accompanying notes are an integral
                   part of these financial statements.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)
                 Statement of Changes in Partners' Equity
               Years ended December 31, 1997, 1996 and 1995


                                              General   Limited
                                              Partners  Partners   Total
                                              --------  --------   -----

Balance at December 31, 1994            $     13,569  2,556,665 2,570,234

 Net income                                   49,078    236,705   285,783

 Distributions                              (44,400)  (509,000) (553,400)
                                                                    -------
---------                               ---------
Balance at December 31, 1995                  18,247  2,284,370 2,302,617

 Net income                                   52,720    335,511   388,231

 Distributions                              (77,400)  (769,213) (846,613)
                                                                    -------
---------                               ---------
Balance at December 31, 1996                 (6,433)  1,850,668 1,844,235

 Net income                                   45,411    210,697   256,108

 Distributions                              (57,100)  (549,958) (607,058)
                                                                    -------
---------                               ---------
Balance at December 31, 1997            $   (18,122)  1,511,407 1,493,285
                                                                    =======
=========                               =========































                  The accompanying notes are an integral
                   part of these financial statements.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)
                         Statements of Cash Flows
               Years ended December 31, 1997, 1996 and 1995


                                                 1997      1996     1995
                                                 ----      ----     ----

Cash flows from operating activities:

 Cash received from net profits interests $    577,610   570,794  583,375
 Cash paid to Managing General Partner
  for administrative fees and general
                                            and   administrative   overhead
(80,881)                                  (81,530)(84,700)
 Interest received                               4,876     4,833    3,519
                                                                   --------
--------                                  --------
   Net  cash provided by operating activities              501,605  494,097
502,194
                                                                   --------
--------                                  --------
Cash flows provided by investing activities:

 Additions to oil and gas properties           (4,126)         -        -
 Sale of oil and gas properties                100,000   127,198  271,657
                                                                   --------
--------                                  --------
  Net cash provided by investing
                                           activities      95,874   127,198
271,657
                                                                   --------
--------                                  --------
Cash flows used in financing activities:

 Distributions to partners                   (607,058) (846,621)(553,416)
                                                                   --------
--------                                  --------
Net increase (decrease) in cash and cash
 equivalents                                   (9,579) (225,326)  220,435

 Beginning of period                            16,680   242,006   21,571
                                                                   --------
--------                                  --------
 End of period                            $      7,101    16,680  242,006
                                                                   ========
========                                  ========


(continued)





















                  The accompanying notes are an integral
                   part of these financial statements.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)
                   Statements of Cash Flows, continued
               Years ended December 31, 1997, 1996 and 1995


                                                 1997      1996      1995
                                                 ----      ----      ----

Reconciliation of net income to net cash
 provided by operating activities:

Net income                                $    256,108   388,231  285,783

Adjustments to reconcile net income to net
 cash provided by operating activities:

   Depreciation, depletion and amortization               198,000   138,966
205,000
  (Increase) decrease in receivables            47,497  (33,100)   12,062
  Decrease in payables                               -         -    (651)
                                                                    -------
-------                                   -------
Net cash provided by operating activities $    501,605   494,097  502,194
                                                                    =======
=======                                   =======

Supplemental schedule of noncash investing
 and financing activities:

 Sale of oil and gas properties included in
   receivable from Managing General Partner           $         -         -
91

 Sale of oil and gas properties included in
  other receivable                        $     38,500   100,000        -





























                  The accompanying notes are an integral
                   part of these financial statements.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


1.   Organization
     Southwest  Royalties Institutional Income Fund X-B, L.P. was organized
     under  the laws of the state of Delaware on November 27, 1990 for  the
     purpose  of acquiring producing oil and gas properties and to  produce
     and market crude oil and natural gas produced from such properties for
     a  term  of 50 years, unless terminated at an earlier date as provided
     for  in the Partnership Agreement.  The Partnership sells its oil  and
     gas  production to a variety of purchasers with the prices it receives
     being  dependent  upon the oil and gas economy.  Southwest  Royalties,
     Inc. serves as the Managing General Partner and H. H. Wommack, III, as
     the  individual  general partner.  Revenues, costs  and  expenses  are
     allocated as follows:

                                                     Limited      General
                                                     Partners     Partners
                                                     --------     --------

     Interest income on capital contributions          100%          -
     Oil and gas sales                                  90%         10%
     All other revenues                                 90%         10%
     Organization and offering costs (1)               100%          -
     Amortization of organization costs                100%          -
     Property acquisition costs                        100%          -
     Gain/loss on property disposition                  90%         10%
     Operating and administrative costs (2)             90%         10%
     Depreciation, depletion and amortization
      of oil and gas properties                        100%          -
     All other costs                                   90%         10%

          (1)All  organization  costs in excess of 3%  of  initial  capital
          contributions  will be paid by the Managing General  Partner  and
          will  be treated as a capital contribution.  The Partnership paid
          the  Managing  General Partner an amount equal to 3%  of  initial
          capital contributions for such organization costs.

          (2)Administrative costs in any year which exceed  2%  of  capital
          contributions shall be paid by the Managing General  Partner  and
          will be treated as a capital contribution.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


2.   Summary of Significant Accounting Policies

     Oil and Gas Properties
     Oil  and  gas properties are accounted for at cost under the full-cost
     method.   Under  this  method, all productive and nonproductive  costs
     incurred   in   connection  with  the  acquisition,  exploration   and
     development of oil and gas reserves are capitalized.  Gain or loss  on
     the   sale  of  oil  and  gas  properties  is  not  recognized  unless
     significant oil and gas reserves are involved.

     The  Partnership's policy for depreciation, depletion and amortization
     of  oil  and  gas  properties is computed under the units  of  revenue
     method.   Under  the units of revenue method, depreciation,  depletion
     and  amortization is computed on the basis of current  gross  revenues
     from production in relation to future gross revenues, based on current
     prices, from estimated production of proved oil and gas reserves.

     Under  the  units  of  revenue method, the  Partnership  computes  the
     provision  by multiplying the total unamortized cost of  oil  and  gas
     properties by an overall rate determined by dividing (a) oil  and  gas
     revenues during the period by (b) the total future gross oil  and  gas
     revenues  as  estimated  by  the Partnership's  independent  petroleum
     consultants.   It  is  reasonably possible  that  those  estimates  of
     anticipated  future  gross revenues, the remaining estimated  economic
     life  of  the product, or both could be changed significantly  in  the
     near  term  due to the potential fluctuation of oil and gas prices  or
     production.   The  depletion estimate would also be affected  by  this
     change.

     Should the net capitalized costs exceed the estimated present value of
     oil  and  gas reserves, discounted at 10%, such excess costs would  be
     charged  to current expense.  As of December 31, 1997, 1996  and  1995
     the  net capitalized costs did not exceed the estimated present  value
     of the oil and gas reserves.

     The  Partnership's interest in oil and gas properties consists of  net
     profits  interests in proved properties located within the continental
     United States.  A net profits interest is created when the owner of  a
     working  interest  in a property enters into an arrangement  providing
     that  the  net profits interest owner will receive a stated percentage
     of  the net profit from the property.  The net profits interest  owner
     will not otherwise participate in additional costs and expenses of the
     property.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


2.   Summary of Significant Accounting Policies - continued

     Estimates and Uncertainties
     The  preparation of financial statements in conformity with  generally
     accepted  accounting principles requires management to make  estimates
     and  assumptions  that  affect  the reported  amounts  of  assets  and
     liabilities and disclosure of contingent assets and liabilities at the
     date  of the financial statements and the reported amounts of revenues
     and expenses during the reporting period.  Actual results could differ
     from those estimates.

     Syndication Costs
     Syndication  costs  are  accounted for as a reduction  of  partnership
     equity.

     Environmental Costs
     The  Partnership  is  subject to extensive federal,  state  and  local
     environmental laws and regulations.  These laws, which are  constantly
     changing, regulate the discharge of materials into the environment and
     may  require  the Partnership to remove or mitigate the  environmental
     effects of the disposal or release of petroleum or chemical substances
     at   various  sites.   Environmental  expenditures  are  expensed   or
     capitalized  depending on their future economic benefit.  Costs  which
     improve a property as compared with the condition of the property when
     originally  constructed  or acquired and costs  which  prevent  future
     environmental contamination are capitalized.  Expenditures that relate
     to  an  existing condition caused by past operations and that have  no
     future  economic benefits are expensed.  Liabilities for  expenditures
     of  a  non-capital  nature are recorded when environmental  assessment
     and/or  remediation  is  probable, and the  costs  can  be  reasonably
     estimated.

     Gas Balancing
     The  Partnership  utilizes the sales method  of  accounting  for  gas-
     balancing  arrangements.  Under this method the Partnership recognizes
     sales revenue on all gas sold.  As of December 31, 1997 and 1996,  the
     Partnership was under produced by 2,195 mcf of gas and as of  December
     31, 1995, the Partnership was over produced by 7 mcf of gas.

     Income Taxes
     No  provision  for  income  taxes  is  reflected  in  these  financial
     statements, since the tax effects of the Partnership's income or  loss
     are passed through to the individual partners.

     In   accordance  with  the  requirements  of  Statement  of  Financial
     Accounting  Standards  No. 109, "Accounting  for  Income  Taxes,"  the
     Partnership's tax basis in its net oil and gas properties at  December
     31,  1997  and 1996 is $469,471 and $526,778, respectively, more  than
     that  shown  on  the  accompanying Balance Sheets in  accordance  with
     generally accepted accounting principles.


<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


2.   Summary of Significant Accounting Policies - continued

     Cash and Cash Equivalents
     For purposes of the statement of cash flows, the Partnership considers
     all  highly liquid debt instruments purchased with a maturity of three
     months or less to be cash equivalents.  The Partnership maintains  its
     cash at one financial institution.

     Number of Limited Partner Units
     As  of  December  31,  1997, 1996 and 1995 there were  11,181  limited
     partner units outstanding held by 612 partners.

     Concentrations of Credit Risk
     The  Partnership is subject to credit risk through trade  receivables.
     Although  a  substantial portion of its debtors'  ability  to  pay  is
     dependent upon the oil and gas industry, credit risk is minimized  due
     to  a  large customer base.  All partnership revenues are received  by
     the   Managing  General  Partner  and  subsequently  remitted  to  the
     partnership and all expenses are paid by the Managing General  Partner
     and subsequently reimbursed by the partnership.

     Fair Value of Financial Instruments
     The  carrying amount of cash and accounts receivable approximates fair
     value due to the short maturity of these instruments.

     Recent Accounting Pronouncements
     In  June 1997, the FASB issued "Reporting Comprehensive Income,"  SFAS
     No.  130,  which  establishes standards for reporting and  display  of
     comprehensive  income  and its components in a full  set  of  general-
     purpose  financial statements.  Specifically, this statements requires
     that an enterprise (i) classify items of other comprehensive income by
     their nature in a financial statement and (ii) display the accumulated
     balance   of  other  comprehensive  income  separately  from  retained
     earnings  and  additional paid-in capital in the equity section  of  a
     statement  of  financial position.  This statement  is  effective  for
     fiscal  years  beginning  after December 15,  1997.   The  Partnership
     anticipates  adoption of SFAS No. 130 in its year ended  December  31,
     1998 financial statements.

     Comprehensive  income consists of the change in equity of  a  business
     enterprise  during  a period from transactions and  other  events  and
     circumstances from nonowner sources.  Specifically, this includes  net
     income  and  other comprehensive income, which is made up  of  certain
     changes in assets and liabilities that are not reported in a statement
     of  operations  but  are included in the balances  within  a  separate
     component  of  equity  in  a  statement of financial  position.   Such
     changes  include,  but  are  not  limited  to,  unrealized  gains  for
     marketable   securities  and  futures  contracts,   foreign   currency
     translation adjustments and minimum pension liability adjustments.

     Net Income (loss) per limited partnership unit
     The  net  income (loss) per limited partnership unit is calculated  by
     using the number of outstanding limited partnership units.

<PAGE>
     Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


3.   Commitments and Contingent Liabilities
     Managing  General  Partner has the right, but not the  obligation,  to
     purchase limited partnership units should an investor desire to  sell.
     The  value of the unit is determined  by adding the sum of (1) current
     assets  less liabilities and (2) the present value of the  future  net
     revenues attributable to proved reserves and by discounting the future
     net  revenues  at  a rate not in excess of the prime rate  charged  by
     NationsBank, N.A. of Midland, Texas plus one percent (1%), which value
     shall be further reduced by a risk factor discount of no more than one-
     third  (1/3) to be determined by the Managing General Partner  in  its
     sole and absolute discretion.

     The  Partnership  is  subject  to various  federal,  state  and  local
     environmental  laws  and  regulations which  establish  standards  and
     requirements  for  protection  of the  environment.   The  Partnership
     cannot  predict the future impact of such standards and  requirements,
     which  are  subject to change and can have retroactive  effectiveness.
     The  Partnership  continues to monitor the status of  these  laws  and
     regulations.

     As  of December 31, 1997, the Partnership has not been fined, cited or
     notified  of any environmental violations and management is not  aware
     of  any  unasserted  violations which would have  a  material  adverse
     effect upon capital expenditures, earnings or the competitive position
     in  the  oil and gas industry.  However, the Managing General  Partner
     does  recognize  by  the very nature of its business,  material  costs
     could be incurred in the near term to bring the Partnership into total
     compliance.   The amount of such future expenditures is  not  reliably
     determinable  due to several factors, including the unknown  magnitude
     of  possible  contaminations, the unknown timing  and  extent  of  the
     corrective  actions  which may be required, the determination  of  the
     Partnership's liability in proportion to other responsible parties and
     the  extent to which such expenditures are recoverable from  insurance
     or indemnifications from prior owners of Partnership's properties.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


4.   Related Party Transactions
     A  significant  portion  of the oil and gas properties  in  which  the
     Partnership  has  an interest are operated by and purchased  from  the
     Managing General Partner.  As is usual in the industry and as provided
     for  in  the  operating  agreement for each  respective  oil  and  gas
     property  in  which the Partnership has an interest, the  operator  is
     paid  an  amount for administrative overhead attributable to operating
     such  properties,  with such amounts to Southwest Royalties,  Inc.  as
     operator  approximating $106,000, $106,000 and $118,000 for the  years
     ended  December 31, 1997, 1996 and 1995, respectively.   In  addition,
     the  Managing  General Partner and certain officers and employees  may
     have  an interest in some of the properties that the Partnership  also
     participates.

     Certain  subsidiaries  or affiliates of the Managing  General  Partner
     perform  various  oilfield  services  for  properties  in  which   the
     Partnership  owns an interest.  Such services aggregated approximately
     $1,800,  $150 and $1,000 for the years ended December 31,  1997,  1996
     and  1995,  respectively. The Managing General Partner  believes  that
     these  costs are comparable to similar charges paid by the Partnership
     to unrelated third parties.

     Southwest  Royalties,  Inc., the Managing General  Partner,  was  paid
     $72,000  during  1997,  1996 and 1995, as an administrative  fee,  for
     indirect general and administrative overhead expenses.

     Receivables  from  Southwest  Royalties, Inc.,  the  Managing  General
     Partner,  of approximately $90,302 and $137,799 are from oil  and  gas
     production, net of lease operating costs and production taxes,  as  of
     December 31, 1997 and 1996, respectively.

     In addition, a director and officer of the Managing General Partner is
     a  partner  in a law firm, with such firm providing legal services  to
     the  Partnership.  There were no legal services provided for the  year
     ended  December  31,  1997 and approximately $50 for  the  year  ended
     December 31, 1996.  There were no legal services provided for the year
     ended December 31, 1995.

5.   Major Customers
     No  material portion of the Partnership's business is dependent  on  a
     single  purchaser, or a very few purchasers, where  the  loss  of  one
     would  have  a  material  adverse impact on  the  Partnership.   Three
     purchasers  accounted for 62% of the Partnership's total oil  and  gas
     production  during  1997:  Mobil Corporation   31%,  Scurlock  Permian
     Corporation    17%  and  Marathon  Petroleum  Company    14%.    Three
     purchasers  accounted for 60% of the Partnership's total oil  and  gas
     production  during  1996:   Mobil Corporation  33%,  Scurlock  Permian
     Corporation 15% and Marathon Petroleum Company 12%.  Three  purchasers
     accounted  for  55% of the Partnership's total oil and gas  production
     during  1995:   Mobil  Corporation, Scurlock Permian  Corporation  and
     Marathon  Petroleum Company purchased 32%, 13% and 10%,  respectively.
     All  purchasers  of  the  Partnership's oil  and  gas  production  are
     unrelated third parties.  In the event any of these purchasers were to
     discontinue  purchasing  the Partnership's  production,  the  Managing
     General  Partner  believes that a substitute purchaser  or  purchasers
     could  be  located without undue delay.  No other purchaser  accounted
     for  an amount equal to or greater than 10% of the Partnership's sales
     of oil and gas production.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


6.   Estimated Oil and Gas Reserves (unaudited)
     The  Partnership's  interest in proved oil  and  gas  reserves  is  as
     follows:

                                                    Oil (bbls)   Gas (mcf)
                                                    ----------   ---------
     Proved developed and undeveloped reserves -

     January 1, 1995                                 677,000     1,398,000

       Revisions of previous estimates               178,000         8,000
       Production                                   (76,000)     (177,000)
       Sale of minerals in place                    (63,000)      (53,000)
                                                     -------     ---------
     December 31, 1995                               716,000     1,176,000

       Revisions of previous estimates               103,000       193,000
       Production                                   (59,000)     (136,000)
       Sale of minerals in place                    (33,000)      (49,000)
                                                     -------     ---------
     December 31, 1996                               727,000     1,184,000

       Revisions of previous estimates             (270,000)     (182,000)
       Production                                   (53,000)     (119,000)
       Sale of minerals in place                     (5,000)       (1,000)
                                                     -------     ---------
     December 31, 1997                               399,000       882,000
                                                     =======     =========

     Proved developed reserves -

     December 31, 1995                               698,000     1,099,000
                                                     =======     =========
     December 31, 1996                               709,000     1,110,000
                                                     =======     =========
     December 31, 1997                               385,000       819,000
                                                     =======     =========

     All  of  the Partnership's reserves are located within the continental
     United States.

     *The  reserve estimates were prepared as of January 1, 1998, by Donald
     R.  Creamer, P.E., an independent registered petroleum engineer.   The
     reserve  estimates were made in accordance with guidelines established
     by  the Securities and Exchange Commission pursuant to Rule 4-10(a) of
     Regulation  S-X.  Such guidelines require oil and gas reserve  reports
     be  prepared under existing economic and operating conditions with  no
     provisions  for  price  and  cost  escalation  except  by  contractual
     arrangements.

     The  New York Mercantile Exchange price at December 31, 1997 of $17.64
     was  used  as  the  beginning basis for  the  oil  price.   Oil  price
     adjustments  from  $17.64  per  barrel were  made  in  the  individual
     evaluations  to  reflect  oil  quality, gathering  and  transportation
     costs.   The  results are an average price received at  the  lease  of
     $16.88  per  barrel  in the preparation of the reserve  report  as  of
     January 1, 1998.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


6.   Estimated Oil & Gas Reserves (unaudited) - continued
     In  the  determination  of  the gas price,  the  New  York  Mercantile
     Exchange price at December 31, 1997 of $2.26 was used as the beginning
     basis.   Gas  price adjustments from $2.26 per Mcf were  made  in  the
     individual   evaluations  to  reflect  BTU  content,   gathering   and
     transportation  costs and gas processing and shrinkage.   The  results
     are  an  average price received at the lease of $2.25 per Mcf  in  the
     preparation of the reserve report as of January 1, 1998.

     The  evaluation of oil and gas properties is not an exact science  and
     inevitably  involves a significant degree of uncertainty, particularly
     with respect to the quantity of oil or gas that any given property  is
     capable of producing.  Estimates of oil and gas reserves are based  on
     available  geological and engineering data, the extent and quality  of
     which may vary in each case and, in certain instances, may prove to be
     inaccurate.   Consequently, properties may be  depleted  more  rapidly
     than the geological and engineering data have indicated.

     Unanticipated  depletion, if it occurs, will result in lower  reserves
     than  previously estimated; thus an ultimately lower  return  for  the
     Partnership.  Basic changes in past reserve estimates occur  annually.
     As  new data is gathered during the subsequent year, the engineer must
     revise  his  earlier estimates.  A year of new information,  which  is
     pertinent  to  the  estimation  of  future  recoverable  volumes,   is
     available  during  the subsequent year evaluation.   In  applying  the
     industry  audit standards and procedures, the new data may  cause  the
     previous  estimates  to  be revised.  This revision  may  increase  or
     decrease   the  earlier  estimated  volumes.   Pertinent   information
     gathered  during  the year may include actual production  and  decline
     rates,  production  from offset wells drilled  to  the  same  geologic
     formation,  increased  or decreased water production,  workovers,  and
     changes   in  lifting  costs,  among  others.   Accordingly,   reserve
     estimates are often different from the quantities of oil and gas  that
     are ultimately recovered.

     The  Partnership has reserves which are classified as proved developed
     producing, proved developed non-producing and proved undeveloped.  All
     of  the proved reserves are included in the engineering reports  which
     evaluate the Partnership's present reserves.

     Because  the  Partnership does not engage in drilling activities,  the
     development  of proved undeveloped reserves is conducted  pursuant  to
     farm-out  arrangements with the Managing General Partner or  unrelated
     third  parties.  Generally, the Partnership retains a carried interest
     such  as an overriding royalty interest under the terms of a farm-out,
     or receives cash.

<PAGE>
         Southwest Royalties Institutional Income Fund X-B, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


6.   Estimated Oil & Gas Reserves (unaudited) - continued
     The  standardized measure of discounted future net cash flows relating
     to  proved oil and gas reserves at December 31, 1997, 1996 and 1995 is
     presented below:

                                              1997       1996        1995
                                              ----       ----        ----

     Future cash inflows, net of
       production and development
      costs                             $  3,015,000  9,904,000  5,846,000
     10% annual discount for
                                        estimated timing of cash
      flows                                1,022,000  4,140,000  2,241,000
                                          ----------  ---------  ---------
     Standardized measure of
       discounted future net cash
      flows                             $  1,993,000  5,764,000  3,605,000
                                          ==========  =========  =========

     The  principal  sources  of  change in  the  standardized  measure  of
     discounted  future  net cash flows for the years  ended  December  31,
     1997, 1996 and 1995 are as follows:

                                             1997        1996        1995
                                             ----        ----        ----

     Sales of oil and gas produced,
       net of production costs          $  (530,000)(1,159,000)  (932,000)
      Changes in prices and production costs         (3,045,000)  3,229,000
605,000
     Changes of production rates
       (timing) and others                   333,000  (102,000)  (718,000)
     Sales of minerals in place             (14,000)  (152,000)  (221,000)
     Revisions of previous
       quantities estimates              (1,091,000)  (205,000)    821,000
     Accretion of discount                   576,000    548,000    335,000
     Discounted future net
       cash flows -
      Beginning of year                    5,764,000  3,605,000  3,715,000
                                          ----------  ---------  ---------
      End of year                       $  1,993,000  5,764,000  3,605,000
                                          ==========  =========  =========

     Future  net cash flows were computed using year-end prices  and  costs
     that  related  to existing proved oil and gas reserves  in  which  the
     Partnership has mineral interests.

<PAGE>
Item 9.   Changes  in and Disagreements With Accountants on Accounting  and
          Financial Disclosure

On  June  9,  1997  Southwest  Royalties, Inc. the  Partnership's  Managing
General  Partner (Southwest Royalties, Inc.) dismissed Joseph Decosimo  and
Company as the Partnership's independent accountants.  The Managing General
Partner's   Board  of  Directors  approved  the  decision  to  change   the
Partnership's independent accountants.

The  reports of Joseph Decosimo and Company on the financial statements for
the  past  two  fiscal years contained no adverse opinion or disclaimer  of
opinion  and were not qualified or modified as to uncertainty, audit  scope
or accounting principle.

In  connection  with its audits for the two most recent  fiscal  years  and
through June 9, 1997, there have been no disagreements with Joseph Decosimo
and  Company on any matter of accounting principles or practices, financial
statements  disclosure, or auditing scope or procedure, which disagreements
if  not  resolved to the satisfaction of Joseph Decosimo and Company  would
have caused them to make reference thereto in their report on the financial
statements for such years.

The  Registrant has requested that Joseph Decosimo and Company  furnish  it
with  a  letter addressed to the SEC stating whether or not is agrees  with
the  above statements.  A copy of that letter is included as Exhibit 16 and
has been filed with the Securities and Exchange Commission.


<PAGE>
                                 Part III

Item 10.  Directors and Executive Officers of the Registrant

Management of the Partnership is provided by Southwest Royalties, Inc.,  as
Managing  General Partner.  The names, ages, offices, positions and  length
of  service of the directors and executive officers of Southwest Royalties,
Inc. are set forth below.  Each director and executive officer serves for a
term  of  one year.  The present directors of the Managing General  Partner
have served in their capacity since the Company's formation in 1983.

     Name                   Age                       Position
--------------------        ---         -----------------------------------
-------
H. H. Wommack, III                      42     Chairman   of   the   Board,
                                        President,
                                        Chief Executive Officer, Treasurer
                                        and Director

H. Allen Corey              43          Secretary and Director

Bill E. Coggin                          44     Vice  President  and   Chief
                                        Financial Officer

Phillip F. Hock, Jr.                    54   Vice President, Exploration

Jon P. Tate                             40     Vice  President,  Land   and
                                        Assistant Secretary

Joel D. Talley              36          Vice President, Acquisitions and
                                        Exploitation Manager

R. Douglas Keathley         42          Vice President, Operations

J. Steven Person            39          Vice President, Marketing

H.  H.  Wommack, III, is Chairman of the Board, President, Chief  Executive
Officer,  Treasurer, principal stockholder and a director of  the  Managing
General  Partner,  and  has  served as its President  since  the  Company's
organization  in August, 1983.  Prior to the formation of the Company,  Mr.
Wommack  was  a  self-employed  independent oil  producer  engaged  in  the
purchase  and sale of royalty and working interests in oil and gas  leases,
and  the drilling of exploratory and developmental oil and gas wells.   Mr.
Wommack  holds  a J.D. degree from the University of Texas  from  which  he
graduated  in  1980, and a B.A. from the University of  North  Carolina  in
1977.

H.  Allen  Corey, a founder of the Managing General Partner, has served  as
the   Managing  General  Partner's  secretary  and  a  director  since  its
inception.   Mr. Corey is President of Trolley Barn Brewery, Inc.,  a  brew
pub restaurant chain based in the Southeast.  Prior to his involvement with
Trolley Barn, Mr. Corey was a partner at the law firm of Miller & Martin in
Chattanooga,  Tennessee.  He is currently of counsel to  the  law  firm  of
Baker,  Donelson,  Bearman  & Caldwell, with the  offices  in  Chattanooga,
Tennessee.  Mr. Corey received a J.D. degree from the Vanderbilt University
Law  School and B.A. degree from the University of North Carolina at Chapel
Hill.

<PAGE>
Bill  E. Coggin, Vice President and Chief Financial Officer, has been  with
the Managing General Partner since 1985.  Mr. Coggin was Controller for Rod
Ric  Corporation of Midland, Texas, an oil and gas drilling company, during
the latter part of 1984.  He was Controller for C.F. Lawrence & Associates,
Inc., an independent oil and gas operator also of Midland, Texas during the
early  part of 1984.  Mr. Coggin taught public school for four years  prior
to his business experience.  Mr. Coggin received a B.S. in Education and  a
B.B.A. in Accounting from Angelo State University.

Phillip   F.   Hock,   Jr.,  Vice  President,  Exploration,   assumed   his
responsibilities  with  the  Managing General Partner  as  a  geologist  in
November 1993.  Prior to joining the Managing General Partner, Mr. Hock was
employed four (4) years by Ramco Oil and Gas as Exploitation Manager (1989-
1993),  Robinson  Brothers Drilling Company as Exploration  Manager  (1980-
1984),  and  as  petroleum  geologist by several companies  throughout  his
career,  Magic Circle Oil and Gas (1988-1989), Reading and Bates  Petroleum
Company (1984-1988), and Exxon (1971-1980).  Mr. Hock received a B.  S.  in
Geology  from  Morehead State University and a M. S. in  Geology  form  the
University of New Mexico.

Jon  P.  Tate,  Vice President, Land and Assistant Secretary,  assumed  his
responsibilities  with  the Managing General Partner  in  1989.   Prior  to
joining  the  Managing  General Partner, Mr.  Tate  was  employed  by  C.F.
Lawrence  & Associates, Inc., an independent oil and gas company,  as  Land
Manager from 1981 through 1989.  Mr. Tate is a member of the Permian  Basin
Landman's  Association and received his B.B.S. degree  from  Hardin-Simmons
University.

Joel  D.  Talley,  Vice  President, Acquisitions and Exploitation  Manager,
assumed his responsibilities with the Managing General Partner on July  15,
1996.   Prior  to  joining  the Managing General Partner,  Mr.  Talley  was
employed for four (4) years by Merit Energy Company as Acquisitions Manager
and  then as Region Manager over West Texas, New Mexico and Wyoming  (1992-
1996)  and eight (8) years by ARCO Oil & Gas Company in various engineering
positions   (1984-1992).   Mr.  Talley  received  his  B.S.  in  Mechanical
Engineering in 1984 from Texas A&M University.

R.    Douglas   Keathley,   Vice   President,   Operations,   assumed   his
responsibilities with the Managing General Partner as a Production Engineer
in  October,  1992.   Prior to joining the Managing  General  Partner,  Mr.
Keathley  was  employed for four (4) years by ARCO Oil  &  Gas  Company  as
senior  drilling  engineer working in all phases of well production  (1988-
1992),  eight  (8)  years by Reading & Bates Petroleum  Company  as  senior
petroleum  engineer responsible for drilling (1980-1988) and two (2)  years
by  Tenneco Oil Company as drilling engineer responsible for all phases  of
drilling   (1978-1980).   Mr.  Keathley  received  his  B.S.  in  Petroleum
Engineering in 1977 from the University of Oklahoma.

J.  Steven  Person, Vice President, Marketing, assumed his responsibilities
with  the Managing General Partner as National Marketing Director in  1989.
Prior  to joining the Managing General Partner, Mr. Person served  as  Vice
President  of  Marketing  for CRI, Inc., and was  associated  with  Capital
Financial  Group and Dean Witter (1983).  He received a B.B.A. from  Baylor
University in 1982 and an M.D.A. from Houston Baptist University in 1987.


<PAGE>
Key Employees

Accounting  and Administrative Officer - Debbie A. Brock, age  45,  assumed
her  position with the Managing General Partner in 1991.  Prior to  joining
the Managing General Partner, Ms. Brock was employed with Western Container
Corporation   as  Accounting  Manager  (1982-1990),  Synthetic   Industries
(Texas), Inc. as Accounting Manager (1976-1982) and held various accounting
positions in the manufacturing industry (1971-1975).  Ms. Brock received  a
B.B.A. from the University of Houston.

Controller - Robert A. Langford, age 48, assumed his responsibilities  with
the  Managing  General Partner in 1992.  Mr. Langford received  his  B.B.A.
degree  in  Accounting  in 1975 from the University  of  Central  Arkansas.
Prior  to  joining the Managing General Partner,  Mr. Langford was employed
with Forest Oil Corporation as Corporate Coordinator, Regional Coordinator,
Accounting  Manager.  He held various other positions  from  1982-1992  and
1976-1980  and was Assistant Controller of National Oil Company from  1980-
1982.

Financial  Reporting  Manager - Bryan Dixon, C.P.A., age  31,  assumed  his
responsibilities  with the Managing General Partner  in  1992.   Mr.  Dixon
received his B.B.A. degree in Accounting in 1988 from Texas Tech University
in  Lubbock,  Texas.   Prior to joining the Managing General  Partner,  Mr.
Dixon was employed as a Senior Auditor with Johnson, Miller & Company  from
1991-1992 and Audit Supervisor for Texas Tech University and the Texas Tech
University Health Sciences Center from 1988-1991.

Production   Superintendent  -  Steve  C.  Garner,  age  56,  assumed   his
responsibilities   with   the  Managing  General  Partner   as   Production
Superintendent  in  July,  1989.  Prior to  joining  the  Managing  General
Partner,  Mr. Garner was employed 16 years by Shell Oil Company working  in
all  phases of oil field production as operations foreman, one and one-half
years  with Petroleum Corporation of Delaware as Production Superintendent,
six  years  as  an independent engineering consultant, and  one  year  with
Citation  Oil & Gas Corp. as a workover, completion and production foreman.
Mr.  Garner has worked extensively in the Permian Basin oil field  for  the
last 25 years.

Tax  Manager  -  Carolyn  Cookson, age 41, assumed her  position  with  the
Managing  General  Partner in April, 1989.  Prior to joining  the  Managing
General  Partner,  Ms. Cookson was employed as Director of  Taxes  at  C.F.
Lawrence  &  Associates,  Inc. from 1983 to  1989,  and  worked  in  public
accounting  at McCleskey, Cook & Green, P.C. from 1981 to 1983  and  Deanna
Brady,  C.P.A.  from 1980 to 1981.  She is a member of  the  Permian  Basin
Chapter  of the Petroleum Accountants' Society, and serves on its Board  of
Directors  and  is  liaison to the Tax Committee.  Ms. Cookson  received  a
B.B.A. in accounting from New Mexico State University.


<PAGE>
Investor  Relations Manager - Sandra K. Flournoy, age 51, came to Southwest
Royalties,  Inc.  in 1988 from Parker & Parsley Petroleum,  where  she  was
Assistant Manager of Investor Services and Broker/Dealer Relations for  two
years.   Prior  to that, Ms. Flournoy was Administrative Assistant  to  the
Superintendent at Greenwood ISD for four years.

In certain instances, the Managing General Partner will engage professional
petroleum   consultants   and  other  independent  contractors,   including
engineers   and   geologists  in  connection  with  property  acquisitions,
geological  and  geophysical  analysis,  and  reservoir  engineering.   The
Managing  General Partner believes that, in addition to its own  "in-house"
staff,  the utilization of such consultants and independent contractors  in
specific  instances  and  on  an  "as-needed"  basis  allows  for   greater
flexibility  and greater opportunity to perform its oil and gas  activities
more economically and effectively.

Item 11.  Executive Compensation

The  Partnership  does not have any directors or executive  officers.   The
executive officers of the Managing General Partner do not receive any  cash
compensation,  bonuses, deferred compensation or compensation  pursuant  to
any  type  of  plan,  from the Partnership.  The Managing  General  Partner
received $72,000 during 1997, 1996 and 1995 as an administrative fee.

Item 12.  Security Ownership of Certain Beneficial Owners and Management

There  are  no  limited partners who own of record, or  are  known  by  the
Managing General Partner to beneficially own, more than five percent of the
Partnership's limited partnership interests.

The  Managing  General Partner owns a nine percent interest  as  a  general
partner.   Through prior purchases, the Managing General Partner also  owns
289  limited  partner  units,  or  a 2.6% limited  partner  interest.   The
Managing  General  Partner  total  percentage  interest  ownership  in  the
Partnership is 11.4%.

No  officer or director of the Managing General Partner owns Units  in  the
Partnership.  H. H. Wommack, III, as the individual general partner of  the
Partnership,  owns a one percent interest in the Partnership as  a  general
partner.   The officers and directors of the Managing General  Partner  are
considered beneficial owners of the limited partner units acquired  by  the
Managing  General Partner by virtue of their status as  such.   A  list  of
beneficial  owners  of  limited partner units,  acquired  by  the  Managing
General Partner, is as follows:

<PAGE>
                                                   Amount and
                                                   Nature of      Percent
                     Name and Address of           Beneficial        of
  Title of Class       Beneficial Owner            Ownership       Class
-------------------  ---------------------------  ---------------  -------
Limited Partnership  Southwest Royalties, Inc.    Directly Owns      2.6%
 Interest            Managing General Partner     289 Units
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  H. H. Wommack, III           Indirectly Owns    2.6%
 Interest            Chairman of the Board,       289 Units
                     President, CEO, Treasurer
                     and Director of Southwest
                     Royalties, Inc., the
                     Managing General Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  H. Allen Corey               Indirectly Owns    2.6%
 Interest            Secretary and Director of    289 Units
                     Southwest Royalties, Inc.,
                     the Managing General
                     Partner
                     633 Chestnut Street
                     Chattanooga, TN  37450-1800

Limited Partnership  Bill E. Coggin               Indirectly Owns    2.6%
 Interest            Vice President and CFO of    289 Units
                     Southwest Royalties, Inc.,
                     the Managing General
                     Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  Phillip F. Hock, Jr.         Indirectly Owns    2.6%
 Interest            Vice President, Exploration  289 Units
                     of Southwest Royalties, Inc.,
                     the Managing General
                     Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  Jon P. Tate                  Indirectly Owns    2.6%
 Interest            Vice President, Land and     289 Units
                     Assistant Secretary of
                     Southwest Royalties, Inc.,
                     the Managing General
                     Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  J. Steven Person             Indirectly Owns    2.6%
 Interest            Vice President, Marketing    289 Units
                     of Southwest Royalties, Inc.,
                     the Managing General
                     Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

<PAGE>
                                                   Amount and
                                                   Nature of      Percent
                     Name and Address of           Beneficial        of
  Title of Class       Beneficial Owner            Ownership       Class
-------------------  ---------------------------  ---------------  -------
Limited Partnership  Joel D. Talley               Indirectly Owns    2.6%
 Interest            Vice President,              289 Units
                     Acquisitions and
                     Exploitation Manager of
                     Southwest Royalties, Inc.,
                     the Managing General Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

Limited Partnership  R. Douglas Keathley          Indirectly Owns    2.6%
 Interest            Vice President, Operations   289 Units
                     of Southwest Royalties, Inc.,
                     the Managing General Partner
                     407 N. Big Spring Street
                     Midland, TX  79701

There  are no arrangements known to the Managing General Partner which  may
at a subsequent date result in a change of control of the Partnership.

Item 13.  Certain Relationships and Related Transactions

In 1997, the Managing General Partner received $72,000 as an administrative
fee.   This  amount  is  part  of the general and  administrative  expenses
incurred by the Partnership.

In  some  instances the Managing General Partner and certain  officers  and
employees  may  be working interest owners in an oil and  gas  property  in
which  the Partnership also has a working interest.  Certain properties  in
which  the Partnership has an interest are operated by the Managing General
Partner,  who  was paid approximately $106,000 for administrative  overhead
attributable to operating such properties during 1997.

Certain  subsidiaries or affiliates of the Managing General Partner perform
various  oilfield services for properties in which the Partnership owns  an
interest.  Such services aggregated approximately $1,800 for the year ended
December 31, 1997.

In  the  opinion  of  management, the terms of the above  transactions  are
similar to ones with unaffiliated third parties.

<PAGE>
                                 Part IV


Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K

          (a)(1)  Financial Statements:

                  Included in Part II of this report --

                  Reports of Independent Accountants
                  Balance Sheets
                  Statements of Operations
                  Statement of Changes in Partners' Equity
                  Statements of Cash Flows
                  Notes to Financial Statements

                     (2)  Schedules required by Article 12 of Regulation S-
                  X  are either omitted because they are not applicable  or
                  because  the  required  information  is  shown   in   the
                  financial statements or the notes thereto.

             (3)  Exhibits:

                                      4      (a)   Certificate  of  Limited
                          Partnership  of Southwest Royalties Institutional
                          Income  Fund X-B, L.P., dated November 27,  1990.
                          (Incorporated  by  reference  from  Partnership's
                          Form 10-K for the fiscal year ended December  31,
                          1990.)

                                            (b)    Agreement   of   Limited
                          Partnership  of Southwest Royalties Institutional
                          Income  Fund X-B, L.P. dated November  27,  1990.
                          (Incorporated  by  reference  from  Partnership's
                          Form 10-K for the fiscal year ended December  31,
                          1991.)

                           16  Letter  on Changes in Certifying  Accountant
                     (Incorporated by reference from Partnership's Form 8-K
                     dated June 9, 1997.)

                  27 Financial Data Schedule

          (b)  Reports on Form 8-K

                  There  were  no  reports filed on  Form  8-K  during  the
              quarter ended December 31, 1997.

<PAGE>
                                Signatures


Pursuant  to  the  requirements of Section 13 or 15(d)  of  the  Securities
Exchange  Act  of 1934, the Partnership has duly caused this report  to  be
signed on its behalf by the undersigned, thereunto duly authorized.


                          Southwest Royalties Institutional Income
                          Fund X-B, L.P., a Delaware limited partnership


                                        By:    Southwest  Royalties,  Inc.,
                                 Managing
                                   General Partner


                          By:    /s/ H. H. Wommack, III
                                 -----------------------------
                                           H. H. Wommack, III, President


                          Date:  March 31, 1998


Pursuant  to the requirements of the Securities Exchange Act of 1934,  this
report  has  been signed below by the following persons on  behalf  of  the
Partnership and in the capacities and on the dates indicated.


By:    /s/ H. H. Wommack, III
       -----------------------------------
       H. H. Wommack, III, Chairman of the
       Board, President, Chief Executive
       Officer, Treasurer and Director


Date:  March 31, 1998


By:    /s/ H. Allen Corey
       -----------------------------
       H. Allen Corey, Secretary and
       Director


Date:  March 31, 1998

<PAGE>