CROSS TIMBERS ROYALTY TRUST

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GLOSSARY OF TERMS



The following are definitions of significant terms used in
this Annual Report:



|                                                 |  |                                                                                                                                                                                                                                                                                                                                                
|------------------------------------------------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                 | 
|Bbl                                              |  | Barrel (of oil)                                                                                                                                                                                                                                                                                                                                
|                                                 | 
|Bcf                                              |  | Billion cubic feet (of natural gas)                                                                                                                                                                                                                                                                                                            
|                                                 | 
|Mcf                                              |  | Thousand cubic feet (of natural gas)                                                                                                                                                                                                                                                                                                           
|                                                 | 
|MMBtu                                            |  | One million British Thermal Units, a common energy measurement                                                                                                                                                                                                                                                                                 
|                                                 | 
|net proceeds                                     |  | Gross proceeds received by XTO Energy from sale of production from the underlying properties, less applicable costs, as defined in the net profits interest conveyances                                                                                                                                                                        
|                                                 | 
|net profits income                               |  | Net proceeds multiplied by the applicable net profits percentage of 75% or 90%, which is paid to the trust by XTO Energy. Net profits income is referred to as royalty
income for income tax purposes.                                                                                                                                     
|                                                 | 
|net profits interest                             |  | An interest in an oil and gas property measured by net profits from the sale of production, rather than a specific portion of production. The following defined net profits interests were
conveyed to the trust from the underlying properties:                                                                                               
|                                                 | 
|                                                 |  | 90% net profits interests  interests that entitle the trust to receive 90% of the net proceeds from the underlying properties that are royalty or overriding royalty interests in
Texas, Oklahoma and New Mexico                                                                                                                              
|                                                 | 
|                                                 |  | 75% net profits interests  interests that entitle the trust to receive 75% of the net proceeds from the underlying properties that are working interests in Texas and
Oklahoma                                                                                                                                                                
|                                                 | 
|royalty interest(and overridingroyalty interest) |  | A nonoperating interest in an oil and gas property that provides the owner a specified share of production without any production expense or development costs                                                                                                                                                                                 
|                                                 | 
|underlying properties                            |  | XTO Energys interest in certain oil and gas properties from which the net profits interests were conveyed. The underlying properties include royalty and overriding royalty interests in
producing and nonproducing properties in Texas, Oklahoma and New Mexico, and working interests in producing properties located in Texas and Oklahoma.
|                                                 | 
|working interest                                 |  | An operating interest in an oil and gas property that provides the owner a specified share of production that is subject to all production expense and development costs                                                                                                                                                                       







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THE TRUST

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Cross Timbers Royalty Trust was created on February 12, 1991 by conveyance of 90% net
profits interests in certain royalty and overriding royalty interest properties in Texas, Oklahoma and New Mexico, and 75% net profits interests in certain working interest properties in Texas and Oklahoma. XTO Energy Inc. owns the underlying
properties from which these net profits interests were conveyed. The net profits interests are the only assets of the trust, other than cash held for trust expenses and for distribution to unitholders.



Net profits income received by the trust on the last business day of each month is calculated
and paid by XTO Energy based on net proceeds received from the underlying properties in the prior month. Distributions, as calculated by the trustee, are paid to month-end unitholders of record within ten business days.



UNITS OF BENEFICIAL INTEREST

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The units of beneficial interest in the trust are listed and traded on the
New York Stock Exchange under the symbol CRT. The following are the high and low unit sales prices and total cash distributions per unit paid by the trust during each quarter of 2006 and 2005:



|        |  |             |       |                       |   |       |  |   |         
|------- |  | ----------- | ----- | --------------------- | - | ----- |  | - | --------
|        |  | Sales Price |       | Distributionsper Unit
|Quarter |  | High        |       | Low                   |  
|2006    |  |             |       |                       |   |       |  |   |         
|First   |  | $           | 49.68 |                       | $ | 40.55 |  | $ | 1.175292
|Second  |  |             | 49.43 |                       |   | 39.42 |  |   | 0.844029
|Third   |  |             | 51.71 |                       |   | 42.91 |  |   | 1.024486
|Fourth  |  |             | 53.75 |                       |   | 42.80 |  |   | 1.197556
|        |  |             |       |                       |   |       |  |   |         
|        |  |             |       |                       |   |       |  | $ | 4.241363
|        |  |             |       |                       |   |       |  |   |         
|2005    |  |             |       |                       |   |       |  |   |         
|First   |  | $           | 45.95 |                       | $ | 35.26 |  | $ | 0.723424
|Second  |  |             | 42.35 |                       |   | 36.05 |  |   | 0.742308
|Third   |  |             | 56.34 |                       |   | 38.55 |  |   | 0.839848
|Fourth  |  |             | 59.00 |                       |   | 45.75 |  |   | 1.072326
|        |  |             |       |                       |   |       |  |   |         
|        |  |             |       |                       |   |       |  | $ | 3.377906
|        |  |             |       |                       |   |       |  |   |         



At December 31, 2006, there were
6,000,000 units outstanding and approximately 417 unitholders of record; 5,793,405 of these units were held by depository institutions.





1



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Forward-Looking Statements



This Annual Report, including the accompanying Form 10-K, includes forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical fact included in this Annual Report and Form 10-K, including,
without limitation, statements regarding estimates of proved reserves, future development plans and costs, and industry and market conditions, are forward-looking statements that are subject to a number of risks and uncertainties which are detailed
in Part I, Item 1A of the accompanying Form 10-K. Although XTO Energy and the trustee believe that the expectations reflected in such forward-looking statements are reasonable, neither XTO Energy nor the trustee can give any assurance that such
expectations will prove to be correct.





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SUMMARY

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The trust was created to collect and distribute monthly net profits income to unitholders.
Trust net profits income is received from two major components, the 90% net profits interests and the 75% net profits interests.



| |  | The 90% net profits interests were conveyed from underlying royalty and overriding royalty interests in producing properties in Texas, Oklahoma and New Mexico. Most
net profits income is from long-lived gas properties in the San Juan Basin of northwestern New Mexico. Because the 90% net profits interests are not subject to production expense or development costs, net profits income from these interests
generally only varies because of changes in sales volumes or prices.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  | The 75% net profits interests were conveyed from underlying working interests in seven large, predominantly oil-producing properties in Texas and Oklahoma. Net
profits income from these properties is reduced by production expense and development costs. If costs exceed revenues from the underlying working interest properties in either Texas or Oklahoma, the 75% net profits interests for that state will not
contribute to trust net profits income until all excess costs and accrued interest have been recovered from future net proceeds of that state. However, such excess costs will not reduce net profits income from the other 75% net profits interests or
from the 90% net profits interests. Such excess costs generally occur during periods of higher development activity and/or lower oil prices.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



The following table summarizes the effect of the above components on distributions per unit for the last three years:



|                                                |  |                |        |     |             |   |        |                |  |   |             |     |  |                |        |     |             |   |        |   |  |   |        |  
|----------------------------------------------- |  | -------------- | ------ | --- | ----------- | - | ------ | -------------- |  | - | ----------- | --- |  | -------------- | ------ | --- | ----------- | - | ------ | - |  | - | ------ | -
|                                                |  | 2006           |        |     | 2005        |   |        | 2004           | 
|                                                |  | MonthlyAverage |        |     | AnnualTotal |   |        | MonthlyAverage |  |   | AnnualTotal |     |  | MonthlyAverage |        |     | AnnualTotal |  
|Net profits income:                             |  |                |        |     |             |   |        |                |  |   |             |     |  |                |        |     |             |   |        |   |  |   |        |  
| 90% net profits interests                     |  | $              | 0.299  | (a) |             | $ | 3.592  | (a)            |  | $ | 0.228       | (b) |  | $              | 2.738  | (b) |             | $ | 0.174  |   |  | $ | 2.092  |  
| 75% net profits interests                     |  |                | 0.058  |     |             |   | 0.702  |                |  |   | 0.058       |     |  |                | 0.697  |     |             |   | 0.037  |   |  |   | 0.445  |  
|Administration expense (net of interest income) |  |                | (0.004 | )   |             |   | (0.053 | )              |  |   | (0.005      | )   |  |                | (0.057 | )   |             |   | (0.004 | ) |  |   | (0.050 | )
|                                                |  |                |        |     |             |   |        |                |  |   |             |     |  |                |        |     |             |   |        |   |  |   |        |  
|Total Distribution                              |  | $              | 0.353  | (a) |             | $ | 4.241  | (a)            |  | $ | 0.281       | (b) |  | $              | 3.378  | (b) |             | $ | 0.207  |   |  | $ | 2.487  |  
|                                                |  |                |        |     |             |   |        |                |  |   |             |     |  |                |        |     |             |   |        |   |  |   |        |  



|(a) | Includes proceeds related to a lawsuit settlement that increased the 2006 distribution by $0.33 per unit (a monthly average of $0.028 per unit).
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Includes proceeds related to a purchasers prior period adjustment that increased the 2005 distribution by $0.27 per unit (a monthly average of $0.023 per unit).
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------



Cost Depletion is generally available to
unitholders as a tax deduction from net profits income. Available depletion is dependent upon the unitholders cost of units, purchase date and prior allowable depletion. It may be more beneficial for unitholders to deduct percentage depletion.
Unitholders should consult their tax advisors for further information.



As an example, a unitholder that acquired units in January 2006 and held them throughout 2006 would be entitled to a cost depletion deduction of approximately 9% of his cost. Assuming a cost of $47.00 per unit, cost depletion would
offset approximately 96% of 2006 taxable trust income. Assuming a 30% tax rate, the 2006 taxable equivalent return as a percentage of unit cost would be 13%. (NOTE- Because the units are a depleting asset, a portion of this return is effectively a
return of capital.)





3



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Reversion Agreement



Certain of the properties underlying the 90% net profits interests are subject to a reversion agreement between XTO Energy and an unrelated third party.
The agreement calls for XTO Energy to transfer 25% of its interest in those properties to the third party when net amounts received by XTO Energy from the properties subject to the agreement equal the purchase price of the properties plus a
1% per month return on the unrecouped purchase price, known as payout. At the time payout occurs and the 25% interest is transferred to the third party, net proceeds payable to the trust and trust distributions to unitholders will be reduced.
Based on recent prices and sales volumes, XTO Energy has informed the trustee that payout could occur by the end of 2007, thereafter reducing monthly distributions by approximately 5%. Payout is affected by product prices and the level of
development of properties subject to the reversion agreement.





4



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TO UNITHOLDERS

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We are pleased to present the 2006 Annual Report of Cross Timbers Royalty Trust. This report
includes a copy of the trusts 2006 Form 10-K as filed with the Securities and Exchange Commission. Both reports contain important information about the trusts net profits interests, including information provided to the trustee by XTO
Energy, and should be read in conjunction with each other.



For the year ended
December 31, 2006, net profits income totaled $25,767,154. After deducting trust administration expense and adding interest income, distributable income was $25,448,178, or $4.241363 per unit. Distributions for the year were higher than in 2005
primarily because of increased gas production and higher oil and gas prices.



Natural gas prices for 2006 averaged $8.79 per Mcf for sales from the underlying properties, a 13% increase from the 2005 average price of $7.76 per Mcf. Gas sales volumes from the underlying properties for the year ended December 31,
2006 totaled 2,666,477 Mcf, or 7,305 Mcf per day, an 18% increase from 2005 production of 2,252,361 Mcf, or 6,171 Mcf per day. Gas sales volumes increased primarily because of the timing of cash receipts, increased production from new wells and
workovers and prior period volume adjustments, partially offset by natural production decline.



The average oil price increased to $59.05 per Bbl, up 19% from the 2005 average price of $49.70 per Bbl. Oil sales volumes from the underlying properties during 2006 were 270,112 Bbls, or 740 Bbls per day, compared to
2005 levels of 270,525 Bbls, or 741 Bbls per day.



As of December 31,
2006, proved reserves for the underlying properties were estimated by independent engineers to be 3.0 million Bbls of oil and 31.9 Bcf of natural gas. Based on an allocation of these reserves, proved reserves attributable to the net profits
interests were estimated to be 1.4 million Bbls of oil and 28.1 Bcf of natural gas. Proved reserves for the underlying properties and attributable to the net profits interests as of December 31, 2006 have been reduced to reflect
anticipated payout as of January 1, 2008 under the reversion agreement in which 25% of XTO Energys interest in certain underlying royalties will transfer to an unrelated third party when payout occurs. See Trustees Discussion
and AnalysisYears Ended December 31, 2006, 2005 and 2004Reversion Agreement.



From year-end 2005 to 2006, oil reserves for the underlying properties decreased 10% primarily because of production. Oil reserves attributable to the net profits interests decreased 17% primarily because of higher
estimated future production costs for underlying properties to the 75% net profits interest, as well as because of 2006 production. Year-end gas reserves for the underlying properties, as well as for the net profits interests, decreased
approximately 3% from 2005 to 2006 primarily because of production, partially offset by reserve additions from development activity in the San Juan Basin. All reserve information prepared by independent engineers has been provided to the trustee by
XTO Energy.



Estimated future net cash flows from proved reserves of the net
profits interests at December 31, 2006 are $196.6 million. Using an annual discount factor of 10%, the present value of estimated future net cash flows at December 31, 2006 is $97.4 million. Proved reserve estimates and related future net
cash flows have been determined based on a year-end West Texas Intermediate posted oil price of $57.75 per Bbl and a year-end average realized gas price of $5.01 per Mcf. Other guidelines used in estimating proved reserves, as prescribed by the
Financial Accounting Standards Board, are described under Item 2 of the accompanying Form 10-K. The present value of estimated future net cash flows is not indicative of the market value of trust units.





5



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As disclosed in the tax instructions provided to unitholders in February 2007, trust distributions are considered
portfolio income, rather than passive income. Unitholders should consult their tax advisors for further information.



Cross Timbers Royalty Trust

|By: | Bank of America, N.A., Trustee
|--- | ------------------------------



|By: | Nancy G. Willis
|--- | ---------------

Vice President





6



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THE UNDERLYING PROPERTIES

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The underlying properties include over 2,900 producing properties with established production
histories in Texas, Oklahoma and New Mexico. The average reserve-to-production index for the underlying properties as of December 31, 2006 is approximately 13 years. This index is calculated using total proved reserves and estimated 2007
production for the underlying properties. The projected 2007 production is from proved developed producing reserves as of December 31, 2006. Based on estimated future net cash flows at year-end oil and gas prices, the proved reserves of the
underlying properties are approximately 36% oil and 64% natural gas. The underlying properties also include certain nonproducing properties in Texas, Oklahoma and New Mexico that are primarily mineral interests. As discussed below under 75%
Net Profits Interests, XTO Energy became operator of the Penwell Unit in August 2004. Other than this property and approximately 20 of the underlying royalty interests in the San Juan Basin that burden operated working interests, XTO Energy
cannot significantly influence or control the operations of the underlying properties.



In January 2006, XTO Energy announced that it would consider selling the underlying properties. However, XTO Energy advised the trustee in August 2006, that after a full review, it has decided to retain ownership of these underlying
property interests at this time.



90% Net Profits Interests



Royalty and overriding royalty properties underlying the 90% net profits interests
represent 76% of the discounted future net cash flows from trust proved reserves at December 31, 2006. Approximately 82% of the discounted future net cash flows from the 90% net profits interests is from gas reserves, totaling 27.8 Bcf. Oil
reserves underlying the 90% net profits interests are primarily located in West Texas and are estimated to be 530,000 Bbls at December 31, 2006.



Because the properties underlying the 90% net profits interests are royalty interests and overriding royalty interests, net profits income from these properties is not
reduced by production expense or development costs. Additionally, net profits income from these interests cannot be reduced by any excess costs of the 75% net profits interests. The trust, therefore, should generally receive monthly net profits
income from these interests, as determined by oil and gas sales volumes and prices.



Most of the trusts gas reserves are located in the San Juan Basin of northwestern New Mexico, one of the largest domestic gas fields. The San Juan Basin royalties produced approximately 74% of the trusts gas sales volumes and
accounted for 53% of the net profits income for 2006. As of December 31, 2006, trust proved gas reserves in this region are estimated to be 22.9 Bcf, or 82% of total trust gas reserves.



Approximately 18% of the trusts 2006 gas sales volumes were from coal seam production
in the San Juan Basin. In October 2002, regulatory authorities approved increasing the density of coal seam wells drilled in the San Juan Basin from one to two wells per 320-acre spacing unit, doubling the number of drill wells allowed. Increasing
the density of coal seam wells could impact a significant portion of the trusts acreage. XTO Energy has informed the trustee that it believes operators will pursue increased density drilling, but the potential effect on the trust is unknown.



Most of the trusts San Juan Basin conventional, or non-coal seam, gas is
produced from the Mesaverde formation. In 1999, this formation was approved for increased density drilling, which doubled the number of drill wells allowed to four per spacing unit. XTO Energy has advised the trustee that the trust has received net
proceeds from additional Mesaverde wells in recent years and that it believes operators will continue to further develop the Mesaverde formation underlying the net profits interests.





7



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75% Net Profits Interests



Underlying the 75% net profits interests are working interests in seven large, predominantly oil-producing properties in Texas and Oklahoma
operated primarily by established oil companies. These properties are located in mature fields undergoing secondary or tertiary recovery operations. Most of the oil produced from the 75% net profits interest properties is sour oil, which is sold at
a wider decrement to NYMEX sweet crude oil prices. As a result of an acquisition in August 2004, XTO Energy became operator of the Penwell Unit. XTO Energys original interest in this unit is one of the properties underlying the Texas 75% net
profits interests. With the exception of the Penwell Unit, XTO Energy generally has little influence or control over operations on any of these properties.



Proved reserves from the 75% net profits interests are almost entirely oil, estimated to be approximately 869,000 Bbls at year-end 2006. Based on year-end oil and gas
prices, proved reserves from these interests represent 24% of the discounted future net cash flows of the trusts proved reserves at December 31, 2006.



Because these underlying properties are working interests, production expense and development costs are deducted in calculating net profits
income from the 75% net profits interests. As a result, net profits income from these interests is affected by the level of maintenance and development activity on these underlying properties. Net profits income is also dependent upon oil and gas
sales volumes and prices and is subject to reduction for any prior period excess costs.



Total 2006 development costs were $724,285, up 13% from 2005 development costs of $641,657. Development costs were higher in 2006 because of increased development activity and higher costs. January and February 2007 development costs
totaled approximately $280,000, and were primarily incurred in fourth quarter 2006.



As reported to XTO Energy by unit operators in February of each year, budgeted development costs were $1.8 million for 2006 and $272,000 for 2005. Actual development costs often differ from amounts budgeted because of changes in product
prices and other factors that may affect the timing or selection of projects. Also, costs are deducted in the calculation of trust net profits income several months after they are incurred by the operator. Unit operators have reported total budgeted
costs, net to the underlying properties, of approximately $2.3 million for 2007 and $1.3 million for 2008.



There were no excess costs in 2004, 2005 or 2006. For information regarding the effect of excess costs on trust net profits income, see Trustees Discussion and AnalysisYears Ended December 31,
2006, 2005 and 2004Costs.





8



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Estimated Proved Reserves and Future Net Cash Flows



The
following are proved reserves of the underlying properties, as estimated by independent engineers, and proved reserves and future net cash flows from proved reserves of the net profits interests, based on an allocation of these reserves, at
December 31, 2006:



|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|------------------------- |  | --------------------- |  | ----------------------- |  | ------------------------------------------------- |  | --------- |  | ------------ | ------- | ---------- | - | ------
|                          |  | Underlying Properties |  | Net Profits Interests  
|                          |  | Proved Reserves (a)   |  | Proved Reserves (a) (b) |  | Future Net Cash Flowsfrom Proved Reserves (a) (c)
|                          |  | Oil(Bbls)             |  | Gas(Mcf)                |  | Oil(Bbls)                                         |  | Gas (Mcf) |  | Undiscounted |         | Discounted
|(in thousands)            |  |                       |  |                         |  |                                                   |  |           |  |              |         |           
|                          |  |                       |  |                         |  |                                                  
|90% Net Profits Interests |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|San Juan Basin            |  | 43                    |  | 25,492                  |  | 39                                                |  | 22,943    |  | $            | 100,490 |            | $ | 46,991
|Other New Mexico          |  | 60                    |  | 211                     |  | 54                                                |  | 194       |  |              | 4,094   |            |   | 2,282 
|Texas                     |  | 442                   |  | 3,142                   |  | 398                                               |  | 2,830     |  |              | 35,209  |            |   | 18,173
|Oklahoma                  |  | 44                    |  | 2,104                   |  | 39                                                |  | 1,821     |  |              | 11,602  |            |   | 6,108 
|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|Total                     |  | 589                   |  | 30,949                  |  | 530                                               |  | 27,788    |  |              | 151,395 |            |   | 73,554
|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|                          |  |                       |  |                         |  |                                                  
|75% Net Profits Interests |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|Texas                     |  | 1,119                 |  | 591                     |  | 426                                               |  | 222       |  |              | 22,410  |            |   | 11,132
|Oklahoma                  |  | 1,277                 |  | 341                     |  | 443                                               |  | 118       |  |              | 22,815  |            |   | 12,702
|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|Total                     |  | 2,396                 |  | 932                     |  | 869                                               |  | 340       |  |              | 45,225  |            |   | 23,834
|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       
|TOTAL                     |  | 2,985                 |  | 31,881                  |  | 1,399                                             |  | 28,128    |  | $            | 196,620 |            | $ | 97,388
|                          |  |                       |  |                         |  |                                                   |  |           |  |              |         |            |   |       

---

|(a) | Based on year-end oil and gas prices. Discounted estimated future net cash flows from proved reserves decreased 31% from year-end 2005 to 2006, primarily because of a 35% decrease
in year-end natural gas prices. For further information regarding proved reserves and the method of allocation of proved reserves to the net profits interests, see Item 2 of the accompanying Form 10-K.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Since the trust has defined net profits interests, the trust does not own a specific percentage of the oil and gas reserves. Because trust reserve quantities are determined using an
allocation formula, any fluctuations in actual or assumed prices or costs will result in revisions to the estimated reserve quantities allocated to the net profits interests.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Before income taxes since future net cash flows are not subject to taxation at the trust level.
|--- | -----------------------------------------------------------------------------------------------





9



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TRUSTEES DISCUSSION AND ANALYSIS

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Years Ended December 31, 2006, 2005 and 2004



Net profits income for 2006 was $25,767,154, as compared with $20,607,961 for 2005 and
$15,222,417 for 2004. The 25% increase in net profits income from 2005 to 2006 was primarily because of increased gas production and higher oil and gas prices. The 35% increase in net profits income from 2004 to 2005 was primarily because of higher
oil and gas prices. During 2006, 2005 and 2004, 68%, 65% and 69%, respectively, of net profits income was derived from gas sales.



Trust administration expense was $376,592 in 2006 as compared to $363,582 in 2005 and $304,390 in 2004. Administration expense increased from 2004 to 2005 primarily
because of the timing of expenditures related to the audit of the trusts internal control over financial reporting. Interest income was $57,616 in 2006, $23,057 in 2005 and $6,031 in 2004. Changes in interest income are attributable to
fluctuations in net profits income and interest rates.



Net profits income is
recorded when received by the trust, which is the month following receipt by XTO Energy, and generally two months after oil production and three months after gas production. Net profits income is generally affected by three major factors:



| |  |  | oil and gas sales volumes,
| | - |  | --------------------------

| |  |  | oil and gas sales prices, and
| | - |  | -----------------------------

| |  |  | costs deducted in the calculation of net profits income.
| | - |  | --------------------------------------------------------



Volumes



Oil. Underlying oil sales volumes were relatively unchanged from 2005 to 2006, as compared to a 2% decrease from 2004 to 2005. Oil sales volumes in 2006 remained relatively unchanged from 2005 primarily because
natural production decline was offset by the timing of cash receipts and increased production from new wells and workovers. Decreased oil sales volumes in 2005 were primarily because of natural production decline, partially offset by the timing of
cash receipts.



Gas. Underlying gas sales volumes increased 18% from
2005 to 2006 as compared to a 13% decrease from 2004 to 2005. Increased gas sales volumes in 2006 were primarily because of the timing of cash receipts, increased production from new wells and workovers and prior period volume adjustments, partially
offset by natural production decline. Decreased gas sales volumes in 2005 were primarily because of natural production decline, as well as the timing of cash receipts and prior period volume adjustments.



Prices



Oil. The average oil price for 2006 was $59.05 per Bbl, 19% higher than the 2005 average oil price of $49.70, which was 39% higher
than the 2004 average price of $35.68. Since early 2004, oil prices have generally been rising primarily because of increasing global demand and supply shortage concerns, inadequate sour crude refining capacity, reduced production as a result of
tropical storms and hurricanes in the Gulf of Mexico in 2005 and political instability. Rising tension in the Middle East caused oil prices to increase to record levels in July 2006, exceeding $78.00 per Bbl. Rising crude oil supplies, reduced
geopolitical tension and the potential for lower demand in a slowing U.S. economy have caused recent oil prices to fluctuate between approximately $50.00 and $60.00 per Bbl. Oil prices are expected to remain volatile. The average NYMEX price for
November 2006 through January 2007 was $58.68 per Bbl. At February 15, 2007, the average NYMEX oil price for the following 12 months was $60.56 per Bbl.



10



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Recent trust oil prices have averaged approximately 11% lower than the NYMEX price.



Gas. The 2006 average gas price was $8.79 per Mcf, a 13% increase from the 2005 average gas price of $7.76, which was 35% higher than
the 2004 average price of $5.73. Excluding the effects of the lawsuit settlement in fourth quarter 2006 and the recalculation and remittance of royalties in third and fourth quarters 2005, the average gas price increased 10% from $7.43 per Mcf in
2005 to $8.18 per Mcf in 2006. See Other Proceeds below. Since early 2004, gas prices have generally been increasing due primarily to increased demand and declining North American production. These trends accelerated in the second half
of 2005 due to the effects of hurricanes on Gulf of Mexico production. During most of 2006, gas prices trended lower primarily because of an adequate natural gas supply inventory due to the warmer than normal weather during the winter of 2005-2006
and the absence of hurricane activity in the Gulf of Mexico in 2006. Much colder temperatures during February 2007 have caused prices to partially rebound. Prices will continue to be affected by weather, the U.S. economy, the level of North American
production, crude oil prices and import levels of liquified natural gas. Natural gas prices are expected to remain volatile.



Historically, trust average gas prices have generally approximated or been higher than NYMEX prices for the related production period. However, because of the effects of
the Gulf hurricanes, production from the underlying properties sold at a significant decrement to NYMEX prices in late 2005 and early 2006. See Gulf of Mexico Hurricanes below.



The average NYMEX price for fourth quarter 2006 was $6.56 per MMBtu. Recent trust gas prices
have averaged approximately 20% higher than the NYMEX price. At February 15, 2007, the average NYMEX gas price for the following 12 months was $8.09 per MMBtu.



Costs



Because properties underlying the 90% net profits interests are royalty and overriding royalty interests, the calculation of net profits income from these interests only includes deductions for production and property
taxes, legal costs, and marketing and transportation charges. In addition to these costs, the calculation of net profits income from the 75% net profits interests includes deductions for production expense and development costs since the related
underlying properties are working interests. Net profits income is calculated monthly for each of the five conveyances under which the net profits interests were conveyed to the trust. If monthly costs exceed revenues for any conveyance, such excess
costs must be recovered, with accrued interest, from future net proceeds of that conveyance and cannot reduce net profits income from other conveyances. Costs have never exceeded revenues from 90% net profits interests, nor are they expected to in
the future. The last time one of the 75% net profits interests conveyances were in an excess cost position was in March 2002; these excess costs and related accrued interest were fully recovered by May 2002.



Total costs deducted in the calculation of net profits income were $10.4 million in 2006,
$8.2 million in 2005 and $7.2 million in 2004. The 27% increase in costs from 2005 to 2006 is attributable to higher production taxes associated with increased revenues, increased production expense related to increased power and fuel costs and the
timing of maintenance projects, higher property taxes related to increased commodity prices and the timing of cash disbursements and higher development costs. The 14% increase in costs from 2004



11



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to 2005 is primarily attributable to higher production taxes associated with increased revenues, higher development costs and increased production expense
related to the timing of maintenance projects.



Unit operators of the
properties underlying the 75% net profits interests have reported total budgeted development costs, net to the underlying properties, of approximately $2.3 million for 2007 and $1.3 million for 2008, as compared to budgeted development costs of
$1.8 million and actual development costs of $724,285 for 2006. Actual development costs often differ from amounts budgeted because of changes in product prices and other factors that may affect the timing or selection of projects.



Other Proceeds



The calculation of net profits income for 2006 includes a lawsuit settlement of $2,209,927 related to underpayment of royalties on
underlying properties in the San Juan Basin. Included in this settlement is interest of $566,848 and additional gas revenue of $1,643,079, which increased the 2006 average gas sales price by $0.61 per Mcf. The total one-time settlement, net to the
trust, was $1,988,934, or $0.33 per unit.



The calculation of net profits
income for 2005 includes $1,831,411 related to a purchasers recalculation and remittance of royalties for prior period production from underlying properties in the San Juan Basin. Included in this amount is interest of $1,081,178 and
additional gas revenue of $750,233, which increased the 2005 average gas sales price by $0.33 per Mcf. The total one-time adjustment, net to the trust, was $1,648,270, or $0.27 per unit.



State of Texas Margin Tax



In May 2006, the State of Texas passed legislation to implement a new margin tax of 1% to be imposed on revenues less certain costs, as specified in the legislation,
generated from Texas activities beginning in 2007. Entities subject to the tax generally include trusts, unless otherwise exempt, and various other types of entities. Trusts that meet statutory requirements are generally exempt from the margin tax
as passive entities; however, there is currently no clear authority that the trust meets requirements for the margin tax exemption as a passive entity. Additional legislative action or issuance of applicable administrative rules by the
state comptroller may be necessary to determine if the trust is exempt. The trust does not currently intend to pay the margin tax, based on the assumption that it is exempt as a passive entity. However, if it is subsequently determined that the
trust is not exempt from the margin tax, the trust would be required to deduct and withhold from future distributions the amounts necessary to pay the margin tax for the entire 2007 year, including the tax liability accruing on income distributed
after January 2007 from which no tax was withheld. Approximately 30% of the trusts net profits income is generated from underlying properties in Texas.



If the trust is exempt from the margin tax at the trust level as a passive entity, each unitholder that is a taxable entity would generally include its share of the
trusts revenues in its margin tax computation. If, however, the margin tax is imposed on the trust at the trust level, each unitholder subject to the margin tax would generally exclude its share of the trusts net income from the margin
tax calculation. Unitholders should consult their tax advisors regarding their individual tax situation.



Gulf of Mexico Hurricanes



In
late August and September 2005, hurricanes in the Gulf of Mexico disrupted a significant portion of U.S. oil and gas production, leading to higher and more volatile commodity prices. These increased prices began



12



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affecting distributions to unitholders beginning with the December 2005 distribution that was paid in January 2006. The underlying properties to the trust
are not located near the Gulf and related production was not significantly affected. However, because of greater supply and weaker demand in areas where trust related oil and gas is produced, the price received for such production was significantly
lower than NYMEX prices, which are generally representative of the price received for gas delivered in the Louisiana Gulf region. Production expense and development costs have increased throughout the industry because of storm damages and related
supply shortages.



Reversion Agreement



Certain of the properties underlying the 90% net profits interests are subject to a
reversion agreement between XTO Energy and an unrelated third party. The agreement calls for XTO Energy to transfer 25% of its interest in those properties to the third party when net amounts received by XTO Energy from the properties subject to the
agreement equal the purchase price of the properties plus a 1% per month return on the unrecouped purchase price, known as payout. At the time payout occurs and the 25% interest is transferred to the third party, net proceeds payable to the
trust and trust distributions to unitholders will be reduced. Based on recent prices and sales volumes, XTO Energy has informed the trustee that payout could occur by the end of 2007, thereafter reducing monthly distributions by approximately 5%.
Payout is affected by product prices and the level of development of properties subject to the reversion agreement.



Fourth Quarter 2006 and 2005



During the quarter ended December 31, 2006, the trust received net profits income totaling $7,222,588, compared with fourth quarter 2005 net profits income of
$6,487,591. This 11% increase is primarily attributable to lawsuit settlement proceeds included in fourth quarter 2006 net profits income. See Other Proceeds below.



Administration expense was $52,178 and trust interest income was $14,926, resulting in fourth quarter 2006 distributable income of
$7,185,336, or $1.197556 per unit. Distributable income for fourth quarter 2005 was $6,433,956, or $1.072326 per unit. Distributions to unitholders for the quarter ended December 31, 2006 were:



|                  |  |                   |  |          
|----------------- |  | ----------------- |  | ---------
|Record Date       |  | Payment Date      |  | Per Unit 
|October 31, 2006  |  | November 14, 2006 |  | $0.298251
|November 30, 2006 |  | December 14, 2006 |  | 0.570012 
|December 29, 2006 |  | January 16, 2007  |  | 0.329293 
|                  |  |                   |  |          
|                  |  |                   |  | $1.197556
|                  |  |                   |  |          



Volumes



Fourth quarter 2006 underlying oil sales volumes were 64,389 Bbls, or 4% lower than 2005
levels. Oil sales volumes decreased in 2006 primarily because of natural production decline, partially offset by the timing of cash receipts and increased volumes from new wells and workovers. Underlying gas sales volumes were 612,878 Mcf, or 8%
higher than 2005 levels. This increase in gas sales volumes was primarily because of the timing of cash receipts and increased production from new wells and workovers, partially offset by natural production decline.





13



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Prices



The average fourth quarter 2006 oil price was $60.12 per Bbl, 2% higher than the fourth quarter 2005 average price of $59.05. The average fourth quarter 2006 gas price
was $10.23 per Mcf, 20% higher than the fourth quarter 2005 average price of $8.50. Excluding the effects of the lawsuit settlement in the fourth quarter 2006 the average price was $7.55. See Other Proceeds below. For further information
about oil and gas prices, see Years Ended December 31, 2006, 2005 and 2004  Prices above.



Costs



Costs deducted in the calculation of fourth quarter 2006 net profits income increased $31,684, or 1%, from fourth quarter 2005. This increase was primarily related to increased purchaser revenue deductions.



Other Proceeds



The fourth quarter 2006 calculation of net profits income includes a lawsuit settlement of
$2,209,927 related to underpayment of royalties on underlying properties in the San Juan Basin. Included in this amount is interest of $566,848 and additional gas revenue of $1,643,079, which increased the fourth quarter 2006 average gas sales price
by $2.68 per Mcf. The total one-time settlement, net to the trust, was $1,988,934, or $0.33 per unit.



The fourth quarter 2005 calculation of net profits income includes $1,081,178 in interest income related to a purchasers recalculation and remittance of royalties for prior period production from underlying
properties in the San Juan Basin. The recalculation and remittance of royalties were included in the third quarter 2005 calculation of net profits income as additional gas revenue of $750,233.



See Item 7 of the accompanying Form 10-K for disclosures regarding liquidity and capital
resources, off-balance sheet arrangements, contractual obligations and commitments, related party transactions and critical accounting policies of the trust. See Item 7A of the accompanying Form 10-K for quantitative and qualitative disclosures
about market risk affecting the trust.





14



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Calculation of Net Profits Income



The following is a summary of the calculation of net profits income received by the trust:



|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|------------------------------- |  | -------------------------- | ---------- | --------------- | - | ---------- |  | ------------- | ---------- | ---- | ---------- |  | - | ---------
|                                |  |                            |            |                 |   |            |  | Quarter Ended
|                                |  | Year Ended December 31 (a) |            | December 31 (a)
|                                |  | 2006                       |            | 2005            |   | 2004       |  | 2006          |            | 2005
|Sales Volumes                   |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Oil (Bbls) (b)                  |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Underlying properties           |  |                            | 270,112    |                 |   | 270,525    |  |               | 275,792    |      | 64,389     |  |   | 67,196   
|Average per day                 |  |                            | 740        |                 |   | 741        |  |               | 754        |      | 700        |  |   | 730      
|Net profits interests           |  |                            | 143,067    |                 |   | 145,698    |  |               | 136,608    |      | 33,999     |  |   | 35,441   
|                                |  |                            |            |                 |  
|Gas (Mcf) (b)                   |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Underlying properties           |  |                            | 2,666,477  |                 |   | 2,252,361  |  |               | 2,584,814  |      | 612,878    |  |   | 567,540  
|Average per day                 |  |                            | 7,305      |                 |   | 6,171      |  |               | 7,062      |      | 6,662      |  |   | 6,169    
|Net profits interests           |  |                            | 2,329,603  |                 |   | 1,965,576  |  |               | 2,272,853  |      | 534,196    |  |   | 495,465  
|                                |  |                            |            |                 |  
|Average Sales Price             |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Oil (per Bbl)                   |  |                            | $59.05     |                 |   | $49.70     |  |               | $35.68     |      | $60.12     |  |   | $59.05   
|Gas (per Mcf) (c)(d)            |  |                            | $8.79      |                 |   | $7.76      |  |               | $5.73      |      | $10.23     |  |   | $8.50    
|                                |  |                            |            |                 |  
|Revenues                        |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Oil sales                       |  | $                          | 15,949,207 |                 | $ | 13,444,407 |  |               | $9,839,883 |      | $3,870,895 |  | $ | 3,967,979
|Gas sales (c)(d)                |  |                            | 23,443,948 |                 |   | 17,471,247 |  |               | 14,823,564 |      | 6,270,832  |  |   | 4,822,822
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Total Revenues                  |  |                            | 39,393,155 |                 |   | 30,915,654 |  |               | 24,663,447 |      | 10,141,727 |  |   | 8,790,801
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|                                |  |                            |            |                 |  
|Costs                           |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Taxes, transportation and other |  |                            | 5,501,724  |                 |   | 4,005,653  |  |               | 3,693,129  |      | 1,259,900  |  |   | 1,132,275
|Production expense (e)          |  |                            | 4,166,959  |                 |   | 3,522,305  |  |               | 3,124,582  |      | 1,006,481  |  |   | 962,863  
|Development costs               |  |                            | 724,285    |                 |   | 641,657    |  |               | 338,812    |      | 190,205    |  |   | 329,764  
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Total Costs                     |  |                            | 10,392,968 |                 |   | 8,169,615  |  |               | 7,156,523  |      | 2,456,586  |  |   | 2,424,902
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|                                |  |                            |            |                 |  
|Other Proceeds                  |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Interest income (c)(d)          |  |                            | 566,848    |                 |   | 1,081,178  |  |               |           |      | 566,848    |  |   | 1,081,178
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Net Proceeds                    |  | $                          | 29,567,035 |                 | $ | 23,827,217 |  | $             | 17,506,924 |      | $8,251,989 |  | $ | 7,447,077
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          
|Net Profits Income              |  | $                          | 25,767,154 |                 | $ | 20,607,961 |  | $             | 15,222,417 |      | $7,222,588 |  | $ | 6,487,591
|                                |  |                            |            |                 |   |            |  |               |            |      |            |  |   |          

---

|(a) | Because of the interval between time of production and receipt of net profits income by the trust, oil and gas sales for the year ended December 31 generally relate to
oil production from November through October and gas production from October through September, while oil and gas sales for the quarter ended December 31 generally relate to oil production from August through October and gas production from
July through September.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Oil and gas sales volumes are allocated to the net profits interests based upon a formula that considers oil and gas prices and the total amount of production expense and
development costs. Changes in any of these factors may result in disproportionate fluctuations in volumes allocated to the net profits interests. Therefore, comparative analysis is based on the underlying properties.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | In fourth quarter 2006, $2,209,927 was received related to a lawsuit settlement for underpayment of royalties of $1,643,079 on certain San Juan Basin properties. Included in
this settlement was interest of $566,848. This settlement increased the average gas sales price by $0.61 for 2006 and by $2.68 for the quarter ended December 31, 2006. The total one-time settlement, net to trust, was $1,988,934, or $0.33 per
unit.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | In third and fourth quarters 2005, $1,831,411 was received related to a purchasers recalculation and remittance of royalties of $750,233 for prior period San Juan Basin
production. This payment included interest of $1,081,178, which was included in the fourth quarter 2005 net profits calculation. This settlement increased the average gas sales price by $0.33 for 2005 and had no effect on the average gas sales price
for fourth quarter 2005. The total one-time adjustment, net to the trust, was $1,648,270 or $0.27 per unit.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | Includes an overhead charge which is deducted and retained by XTO Energy. As of December 31, 2006, this charge was $27,778 per month (including a monthly overhead charge
of $2,470 which XTO Energy deducts as operator of the Penwell Unit) and is subject to adjustment each May based on an oil and gas industry index.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------





15



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Cross Timbers Royalty Trust

---



STATEMENTS OF ASSETS, LIABILITIES AND TRUST CORPUS



|                                                                                 |  |             |            |      |   |           
|-------------------------------------------------------------------------------- |  | ----------- | ---------- | ---- | - | ----------
|                                                                                 |  | December 31
|                                                                                 |  | 2006        |            | 2005
|Assets                                                                           |  |             |            |      |   |           
|Cash and short-term investments                                                  |  | $           | 1,970,795  |      | $ | 2,111,521 
|Interest to be received                                                          |  |             | 4,963      |      |   | 2,489     
|Net profits interests in oil and gas propertiesnet (Notes 1 and 2)              |  |             | 19,679,502 |      |   | 21,204,723
|                                                                                 |  |             |            |      |   |           
|                                                                                 |  | $           | 21,655,260 |      | $ | 23,318,733
|                                                                                 |  |             |            |      |   |           
|Liabilities and Trust Corpus                                                     |  |             |            |      |   |           
|Distribution payable to unitholders                                              |  | $           | 1,975,758  |      | $ | 2,114,010 
|Trust corpus (6,000,000 units of beneficial interest authorized and outstanding) |  |             | 19,679,502 |      |   | 21,204,723
|                                                                                 |  |             |            |      |   |           
|                                                                                 |  | $           | 21,655,260 |      | $ | 23,318,733
|                                                                                 |  |             |            |      |   |           



---



STATEMENTS OF DISTRIBUTABLE INCOME



|                                                |  |                        |            |      |   |            |  |   |           
|----------------------------------------------- |  | ---------------------- | ---------- | ---- | - | ---------- |  | - | ----------
|                                                |  | Year Ended December 31
|                                                |  | 2006                   |            | 2005 |   | 2004      
|Net profits income                              |  | $                      | 25,767,154 |      | $ | 20,607,961 |  | $ | 15,222,417
|Interest income                                 |  |                        | 57,616     |      |   | 23,057     |  |   | 6,031     
|                                                |  |                        |            |      |   |            |  |   |           
|Total income                                    |  |                        | 25,824,770 |      |   | 20,631,018 |  |   | 15,228,448
|Administration expense                          |  |                        | 376,592    |      |   | 363,582    |  |   | 304,390   
|                                                |  |                        |            |      |   |            |  |   |           
|Distributable income                            |  | $                      | 25,448,178 |      | $ | 20,267,436 |  | $ | 14,924,058
|                                                |  |                        |            |      |   |            |  |   |           
|Distributable income per unit (6,000,000 units) |  | $                      | 4.241363   |      | $ | 3.377906   |  | $ | 2.487343  
|                                                |  |                        |            |      |   |            |  |   |           



See
Accompanying Notes to Financial Statements.



---



16



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Cross Timbers Royalty Trust

---



STATEMENTS OF CHANGES IN TRUST CORPUS



|                                      |  |                        |             |   |      |   |             |      |  |   |             |  
|------------------------------------- |  | ---------------------- | ----------- | - | ---- | - | ----------- | ---- |  | - | ----------- | -
|                                      |  | Year Ended December 31 |            
|                                      |  | 2006                   |             |   | 2005 |   |             | 2004 | 
|Trust corpus, beginning of year       |  | $                      | 21,204,723  |   |      | $ | 22,847,694  |      |  | $ | 24,665,401  |  
|Amortization of net profits interests |  |                        | (1,525,221  | ) |      |   | (1,642,971  | )    |  |   | (1,817,707  | )
|Distributable income                  |  |                        | 25,448,178  |   |      |   | 20,267,436  |      |  |   | 14,924,058  |  
|Distributions declared                |  |                        | (25,448,178 | ) |      |   | (20,267,436 | )    |  |   | (14,924,058 | )
|                                      |  |                        |             |   |      |   |             |      |  |   |             |  
|Trust corpus, end of year             |  | $                      | 19,679,502  |   |      | $ | 21,204,723  |      |  | $ | 22,847,694  |  
|                                      |  |                        |             |   |      |   |             |      |  |   |             |  



See
Accompanying Notes to Financial Statements.



17



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Cross Timbers Royalty Trust

---



NOTES TO FINANCIAL STATEMENTS



1. Trust Organization and Provisions



Cross Timbers Royalty Trust was created on February 12, 1991 by
predecessors of XTO Energy Inc., when the following net profits interests were conveyed under five separate conveyances to the trust effective October 1, 1990, in exchange for 6,000,000 units of beneficial interest in the trust:



| |  | 90% net profits interests in certain producing and nonproducing royalty and overriding royalty interest properties in Texas, Oklahoma and New Mexico, and
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------

| |  | 75% net profits interests in certain nonoperated working interest properties in Texas and Oklahoma.
| | - | ---------------------------------------------------------------------------------------------------



The underlying properties from which the net profits interests were carved are currently owned by XTO Energy (Note 5). The
trusts initial public offering was in February 1992.



Bank of America, N.A. is the trustee of the trust. The trust indenture provides, among other provisions, that:



| |  | the trust may not engage in any business activity or acquire any assets other than the net profits interests and specific short-term cash investments;
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------

| |  | the trust may not dispose of all or part of the net profits interests unless approved by 80% of the unitholders, or upon trust termination, and any sale must be for cash with the
proceeds promptly distributed to the unitholders;
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  | the trustee may establish a cash reserve for payment of any liability that is contingent or not currently payable;
| | - | ------------------------------------------------------------------------------------------------------------------

| |  | the trustee may borrow funds required to pay trust liabilities if fully repaid prior to further distributions to unitholders;
| | - | -----------------------------------------------------------------------------------------------------------------------------

| |  | the trustee will make monthly cash distributions to unitholders (Note 3); and
| | - | -----------------------------------------------------------------------------

| |  | the trust will terminate upon the first occurrence of:
| | - | ------------------------------------------------------

| |  | disposition of all net profits interests pursuant to terms of the trust indenture,
| | - | ----------------------------------------------------------------------------------

| |  | gross revenue of the trust is less than $1 million per year for two successive years, or
| | - | ----------------------------------------------------------------------------------------

| |  | a vote of 80% of the unitholders to terminate the trust in accordance with provisions of the trust indenture.
| | - | -------------------------------------------------------------------------------------------------------------



2. Basis of Accounting



The financial statements of the trust are prepared on the following basis and are not intended to present financial position
and results of operations in conformity with U.S. generally accepted accounting principles:



| |  | Net profits income is recorded in the month received by the trustee (Note 3).
| | - | -----------------------------------------------------------------------------

| |  | Interest income, interest to be received and distribution payable to unitholders include interest to be earned on net profits income from the monthly record date (last business day
of the month) through the date of the next distribution.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| |  | Trust expenses are recorded based on liabilities paid and cash reserves established by the trustee for liabilities and contingencies.
| | - | -------------------------------------------------------------------------------------------------------------------------------------



18



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| |  | Distributions to unitholders are recorded when declared by the trustee (Note 3).
| | - | --------------------------------------------------------------------------------



The most significant differences between the trusts financial statements and those prepared in accordance with U.S.
generally accepted accounting principles are:



| |  | Net profits income is recognized in the month received rather than accrued in the month of production.
| | - | ------------------------------------------------------------------------------------------------------

| |  | Expenses are recognized when paid rather than when incurred.
| | - | ------------------------------------------------------------

| |  | Cash reserves may be established by the trustee for certain contingencies that would not be recorded under generally accepted accounting principles.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------



This comprehensive basis of accounting other than U.S. generally accepted
accounting principles corresponds to the accounting permitted for royalty trusts by the U.S. Securities and Exchange Commission, as specified by Staff Accounting Bulletin Topic 12:E, Financial Statements of Royalty Trusts.



Most accounting pronouncements apply to entities whose financial statements
are prepared in accordance with U.S. generally accepted accounting principles, directing such entities to accrue or defer revenues and expenses in a period other than when such revenues were received or expenses were paid. Because the trusts
financial statements are prepared on the modified cash basis, as described above, most accounting pronouncements are not applicable to the trusts financial statements.



The initial carrying value of the net profits interests of $61,100,449 was XTO Energys historical net book value of
the interests on February 12, 1991, the date of the transfer to the trust. Amortization of the net profits interests is calculated on a unit-of-production basis and charged directly to trust corpus. Accumulated amortization was $41,420,947
as of December 31, 2006 and $39,895,726 as of December 31, 2005.



3. Distributions to Unitholders



The trustee
determines the amount to be distributed to unitholders each month by totaling net profits income and other cash receipts, and subtracting liabilities paid and adjustments in cash reserves established by the trustee. The resulting amount (with
estimated interest to be received on such amount through the distribution date) is distributed to unitholders of record within ten business days after the monthly record date, the last business day of the month.



Net profits income received by the trustee consists of net proceeds received
in the prior month by XTO Energy from the underlying properties multiplied by the net profits percentage of 90% or 75%. Net proceeds are the gross proceeds received from the sale of production, less applicable costs. For the 90% net profits
interests, such costs generally include production and property taxes, legal costs, and marketing and transportation charges. In addition to these costs, the 75% net profits interests include deductions for production expense and development costs.
See Note 8.



XTO Energy, as owner of the underlying properties,
computes net profits income separately for each of the five conveyances (Note 1). If costs exceed gross proceeds for any conveyance, such excess costs cannot be used to reduce the amounts to be received under the other conveyances. The trust is not
liable for excess costs; however, such excess costs plus accrued interest are deducted in calculating future net profits income from that conveyance.





19



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4. Federal Income Taxes



Tax counsel has advised the trust that, under current tax laws, the trust will be classified as a grantor trust for federal income tax purposes and
therefore is not subject to taxation at the trust level. However, the opinion of tax counsel is not binding on the Internal Revenue Service.



For federal income tax purposes, unitholders of a grantor trust are considered to own trust income and principal as though no trust were in existence. The
income of the trust is deemed to be received or accrued by the unitholders at the time such income is received or accrued by the trust, rather than when distributed by the trust.



5. XTO Energy Inc.



The underlying properties include approximately 20 overriding royalty interests in New Mexico that burden working interests owned and operated by XTO
Energy. These working interests were purchased by XTO Energy after the net profits interests were conveyed to the trust. XTO Energy also operates the Penwell Unit, following the acquisition of an additional interest in this unit in August 2004. XTO
Energys original interest in the Penwell Unit is one of the properties underlying the Texas 75% net profits interests. Other than these properties, XTO Energy does not operate or control any of the underlying properties or related working
interests.



In January 2006, XTO Energy announced that it would
consider selling the underlying properties. However, XTO Energy advised the trustee in August 2006, that after a full review, it has decided to retain ownership of these underlying property interests at this time.



In computing net profits income for the 75% net profits interests (Note 3),
XTO Energy deducts an overhead charge as reimbursement for costs associated with monitoring these interests. This charge at December 31, 2006 was $25,308 per month, or $303,696 annually (net to the trust of $227,772 annually). XTO Energy also
deducts an overhead charge as operator of the Penwell Unit. As of December 31, 2006, overhead attributable to the Penwell Unit was $2,470 per month, or $29,640 annually (net to the trust of $22,230 annually). These overhead charges are subject
to an annual adjustment based on an oil and gas industry index.



6.
Reversion Agreement



Certain of the properties underlying
the 90% net profits interests are subject to a reversion agreement between XTO Energy and an unrelated party. The agreement calls for XTO Energy to transfer 25% of its interest in those properties to the third party when net amounts received by XTO
Energy from the properties subject to the agreement equal the purchase price of the properties plus a 1% per month return on the unrecouped purchase price, known as payout. At the time payout occurs and the 25% interest is transferred to the
third party, net proceeds payable to the trust and trust distributions to unitholders will be reduced. Based on recent prices and sales volumes, XTO Energy has informed the trustee that payout could occur by the end of 2007, thereafter reducing
monthly distributions by approximately 5%. Payout is affected by product prices and the level of development of properties subject to the reversion agreement.



7. Contingencies



In May 2006, the State of Texas passed legislation to implement a new margin tax of 1% to be imposed on revenues less certain costs, as specified in the
legislation, generated from Texas activities beginning in 2007. Entities subject to the tax generally include trusts, unless otherwise exempt, and



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various other types of entities. Trusts that meet statutory requirements are generally exempt from the margin tax as passive entities; however,
there is currently no clear authority that the trust meets requirements for the margin tax exemption as a passive entity. Additional legislative action or issuance of applicable administrative rules by the state comptroller may be necessary to
determine if the trust is exempt. The trust does not currently intend to pay the margin tax, based on the assumption that it is exempt as a passive entity. However, if it is subsequently determined that the trust is not exempt from the margin tax,
the trust would be required to deduct and withhold from future distributions the amounts necessary to pay the margin tax for the entire 2007 year, including the tax liability accruing on income distributed after January 2007 from which no tax was
withheld. Approximately 30% of the trusts net profits income is generated from underlying properties in Texas.



8. Purchaser Adjustments and Lawsuit Settlements



From time-to-time, XTO Energy receives net proceeds for the underlying properties related to significant prior period purchaser adjustments and lawsuit
settlements, including related interest income. Because of the size and nature of these adjustments and settlements, XTO Energy has informed the trustee that it believes these should be considered one-time, or nonrecurring, events. Since most of the
properties in the trust are nonoperated, these adjustments are generally not known to XTO Energy until reported by the purchaser. These items are included and reported in net profits income in the month received by the trust, which is generally the
month following receipt by XTO Energy.



In 2006, the
calculation of net profits income includes a lawsuit settlement of $2,209,927 related to underpayment of royalties on underlying properties in the San Juan Basin. Included in this settlement is interest of $566,848 and additional gas revenue of
$1,643,079. The total one-time settlement, net to the trust, was $1,988,934, or $0.33 per unit.



In 2005, the calculation of net profits income includes $1,831,411 related to a purchasers recalculation and remittance of royalties for prior
period production from underlying properties in the San Juan Basin. Included in this amount is interest of $1,081,178 and additional gas revenue of $750,233. The total one-time adjustment, net to the trust, was $1,648,270, or $0.27 per unit.



9. Supplemental Oil and Gas Reserve Information (Unaudited)



Proved oil and gas reserve information is included in Item 2 of the
trusts Annual Report on Form 10-K which is included in this report.



10. Quarterly Financial Data (Unaudited)



The
following is a summary of net profits income, distributable income and distributable income per unit by quarter for 2006 and 2005:



|                   |  |                   |            |                     |   |                             |  |   |         
|------------------ |  | ----------------- | ---------- | ------------------- | - | --------------------------- |  | - | --------
|                   |  | Net ProfitsIncome |            | DistributableIncome |   | DistributableIncome perUnit
|2006               |  |                   |            |                     |   |                             |  |   |         
|First Quarter      |  | $                 | 7,149,251  |                     | $ | 7,051,752                   |  | $ | 1.175292
|Second Quarter     |  |                   | 5,216,449  |                     |   | 5,064,174                   |  |   | 0.844029
|Third Quarter      |  |                   | 6,178,866  |                     |   | 6,146,916                   |  |   | 1.024486
|Fourth Quarter (a) |  |                   | 7,222,588  |                     |   | 7,185,336                   |  |   | 1.197556
|                   |  |                   |            |                     |   |                             |  |   |         
|                   |  | $                 | 25,767,154 |                     | $ | 25,448,178                  |  | $ | 4.241363
|                   |  |                   |            |                     |   |                             |  |   |         
|2005               |  |                   |            |                     |   |                             |  |   |         
|First Quarter      |  | $                 | 4,462,096  |                     | $ | 4,340,544                   |  | $ | 0.723424
|Second Quarter     |  |                   | 4,589,164  |                     |   | 4,453,848                   |  |   | 0.742308
|Third Quarter (b)  |  |                   | 5,069,110  |                     |   | 5,039,088                   |  |   | 0.839848
|Fourth Quarter (c) |  |                   | 6,487,591  |                     |   | 6,433,956                   |  |   | 1.072326
|                   |  |                   |            |                     |   |                             |  |   |         
|                   |  | $                 | 20,607,961 |                     | $ | 20,267,436                  |  | $ | 3.377906
|                   |  |                   |            |                     |   |                             |  |   |         

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|(a) | Net profits income and distributable income include a one-time payment related to a lawsuit settlement of $1,988,934 net to the trust, or $0.33 distributable income per unit
(Note 8).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Net profits income and distributable income include a one-time purchaser adjustment related to prior period royalties of $675,210 net to the trust, or $0.11 distributable
income per unit (Note 8).
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Net profits income and distributable income include a one-time purchaser adjustment related to prior period royalties of $973,060 net to the trust, or $0.16 distributable
income per unit (Note 8).
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------





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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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Bank of America, N.A., as Trustee for the Cross Timbers Royalty Trust:



We have audited the accompanying statements of
assets, liabilities, and trust corpus of the Cross Timbers Royalty Trust as of December 31, 2006 and 2005, and the related statements of distributable income and changes in trust corpus for each of the years in the three-year period ended
December 31, 2006. These financial statements are the responsibility of the trustee. Our responsibility is to express an opinion on these financial statements based on our audits.



We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).
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 the trustee, and evaluating the overall financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.



As described in Note 2 to
the financial statements, these financial statements were prepared on the modified cash basis of accounting, which is a comprehensive basis of accounting other than accounting principles generally accepted in the United States of America.



In our opinion, the financial statements referred to above
present fairly, in all material respects, the assets, liabilities, and trust corpus of the Cross Timbers Royalty Trust as of December 31, 2006 and 2005 and its distributable income and changes in trust corpus for each of the years in the
three-year period ended December 31, 2006 in conformity with the modified cash basis of accounting described in Note 2.



We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of the Cross
Timbers Royalty Trusts internal control over financial reporting as of December 31, 2006, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the
Treadway Commission (COSO), and our report dated February 28, 2007 expressed an unqualified opinion on the trustees assessment of, and the effective operation of, internal control over financial reporting.



KPMG LLP



Dallas, Texas

February 28, 2007





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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

---



Bank of America, N.A., as Trustee for the Cross Timbers Royalty Trust:



We have audited the trustees assessment,
included in Trustees Report on Internal Control over Financial Reporting under Item 9A of the accompanying Annual Report on Form 10-K,that Cross Timbers Royalty Trust maintained effective internal control over financial reporting
as of December 31, 2006, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The trustee of the Cross Timbers Royalty Trust is
responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on the trustees assessment
and an opinion on the effectiveness of the trusts internal control over financial reporting based on our audit.



We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we
plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial
reporting, evaluating the trustees assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit
provides a reasonable basis for our opinion.



The trusts
internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with the modified cash
basis of accounting. The trusts internal control over financial reporting includes those policies and procedures that: (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions
and dispositions of the assets of the trust; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with the modified cash basis of accounting, and that receipts
and expenditures of the trust are being made only in accordance with authorizations of the trustee; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the
trusts assets that could have a material effect on the financial statements.



Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk
that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.



In our opinion, the trustees assessment that the Cross Timbers Royalty Trust maintained effective internal control over financial reporting as of
December 31, 2006, is fairly stated, in all material respects, based on criteria established in Internal ControlIntegrated Framework issued by COSO. Also, in our opinion, the Cross Timbers Royalty Trust maintained, in all material
respects, effective internal control over financial reporting as of December 31, 2006, based on criteria established in Internal ControlIntegrated Framework issued by COSO.





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We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board
(United States), the statements of assets, liabilities, and trust corpus of the Cross Timbers Royalty Trust as of December 31, 2006 and 2005, and the related statements of distributable income and changes in trust corpus for each of the years
in the three-year period ended December 31, 2006, and our report dated February 28, 2007 expressed an unqualified opinion on those financial statements and included an explanatory paragraph that described the trusts method of
accounting as explained in Note 2 to the financial statements.



KPMG LLP



Dallas, Texas

February 28, 2007





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CROSS TIMBERS ROYALTY TRUST



901
Main Street, 17thFloor

P.O. Box 830650

Dallas, Texas 75283-0650

(877) 228-5084

Bank of America, N.A., Trustee



A copy of the Cross Timbers Royalty Trust Form 10-K has been provided with this Annual Report. Additional copies of this Annual Report and Form 10-K will be provided to
unitholders without charge upon request. Copies of exhibits to the Form 10-K may be obtained upon request or from the trusts web site at www.crosstimberstrust.com.



WEB SITE



www.crosstimberstrust.com



AUDITORS



KPMG LLP

Dallas, Texas



LEGAL COUNSEL



Thompson & Knight L.L.P.

Dallas, Texas



TAX COUNSEL



Winstead Sechrest & Minick P.C.

Houston, Texas



TRANSFER AGENT AND REGISTRAR



Mellon Investor Services, L.L.C.

www.melloninvestor.com



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