UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2007

      OR


  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the transition period from ____________ to ____________



      Commission file number: 333-130192-37

      J.P. Morgan Mortgage Trust 2007-S1
      (exact name of issuing entity as specified in its charter)

      J.P. Morgan Acceptance Corporation I
      (exact name of the depositor as specified in its charter)

      J.P. Morgan Mortgage Acquisition Corp.
      (exact name of the sponsor as specified in its charter)



  Delaware                                13-3475488
  (State or other jurisdiction of         (I.R.S. Employer
  incorporation or organization)          Identification No.)



  270 Park Avenue
   New York, NY                                10017
  (Address of principal executive             (Zip Code)
  offices)


 Telephone number, including area code: (212) 648-0364



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

    NONE.



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

    NONE.



  Indicate by check mark if the registrant is a well-known seasoned issuer, as
  defined in Rule 405 of the Securities Act.

    Yes ___     No  X



  Indicate by check mark if the registrant is not required to file reports
  pursuant to Section 13 or Section 15(d) of the Act.

    Yes ___     No  X




  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange Act
  of 1934 during the preceding 12 months (or for such shorter period that the
  registrant was required to file such reports), and (2) has been subject to
  such filing requirements for the past 90 days.

    Yes  X      No ___



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

    Not applicable.



  Indicate by check mark whether the registrant is a large accelerated filer,
  an accelerated filer, a non-accelerated filer, or a smaller reporting
  company.  See the definitions of "large accelerated filer", "accelerated
  filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

   Large accelerated filer ___
   Accelerated filer ___
   Non-accelerated filer X
   Smaller reporting company ___

  Indicate by check mark whether the registrant is a shell company (as defined
  in Rule 12b-2 of the Act).

    Yes ___     No  X



  State the aggregate market value of the voting and non-voting common equity
  held by non-affiliates computed by reference to the price at which the
  common equity was last sold, or the average bid and asked price of such
  common equity, as of the last business day of the registrant's most recently
  completed second fiscal quarter.

    Not applicable.



  Indicate by check mark whether the registrant has filed all documents and
  reports required to be filed by Section 12, 13 or 15(d) of the Securities
  Exchange Act of 1934 subsequent to the distribution of securities under a
  plan confirmed by a court.

    Not applicable.



  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of the latest practicable date.

    Not applicable.



  DOCUMENTS INCORPORATED BY REFERENCE

  List hereunder the following documents if incorporated by reference and the
  Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document
  is incorporated: (1)Any annual report to security holders; (2) Any proxy or
  information statement; and (3)Any prospectus filed pursuant to Rule 424(b)
  or (c) under the Securities Act of 1933. The listed documents should be
  clearly described for identification purposes (e.g., annual report to
  security holders for fiscal year ended December 24, 1980).

    Not applicable.





                                     PART I

  Item 1.      Business.

               Omitted.


  Item 1A.     Risk Factors.

               Omitted.


  Item 1B.     Unresolved Staff Comments.

               None.


  Item 2.      Properties.

               Omitted.


  Item 3.      Legal Proceedings.

               Omitted.


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

               Omitted.




                                     PART II

  Item 5.      Market for Registrant's Common Equity, Related Stockholder
               Matters and Issuer Purchases of Equity Securities.

               Omitted.


  Item 6.      Selected Financial Data.

               Omitted.


  Item 7.      Management's Discussion and Analysis of Financial Condition and
               Results of Operation.

               Omitted.


  Item 7A.     Quantitative and Qualitative Disclosures About Market Risk.

               Omitted.


  Item 8.      Financial Statements and Supplementary Data.

               Omitted.


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

               Omitted.


  Item 9A.     Controls and Procedures.

               Omitted.


  Item 9A(T).  Controls and Procedures.

               Omitted.


  Item 9B.     Other Information.

               None.




                                    PART III

  Item 10.     Directors, Executive Officers and Corporate Governance.

               Omitted.


  Item 11.     Executive Compensation.

               Omitted.


  Item 12.     Security Ownership of Certain Beneficial Owners and Management
               and Related Stockholder Matters.

               Omitted.


  Item 13.     Certain Relationships and Related Transactions, and Director
               Independence.

               Omitted.


  Item 14.     Principal Accounting Fees and Services.

               Omitted.




  ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB


Item 1112(b) of Regulation AB, Significant Obligor Financial Information.

No single obligor represents 10% or more of the pool assets held by the issuing
entity.



Item 1114(b)(2) of Regulation AB, Significant Enhancement  Provider Financial
Information.

No entity or group of affiliated entities provides any external credit
enhancement or other support for the certificates within this transaction as
described under Item 1114 (a) of Regulation AB.



Item 1115(b) of Regulation AB, Certain Derivatives Instruments (Financial
Information).

JPMorgan Chase Bank, National Association provides yield maintenance agreement
derivative instruments for the Class 2-A-1 Certificates and Class 2-A-3
Certificates as disclosed in the 424(b)(5) filing dated April 2, 2007,
Commission File Number 333-130192-37, CIK Number 0001393877. No additional
disclosure is necessary because the significance percentage for each of the
yield maintenance agreements is less than 10%.



Item 1117 of Regulation AB, Legal Proceedings.

On March 26, 2008, the depositor and the issuing entity were served with a
class action lawsuit filed by Plumbers' & Pipefitters' Local #562 Supplemental
Plan & Trust and Plumbers' & Pipefitters' Local #562 Pension Fund before the
Supreme Court of the State of New York. The suit involves claims under section
11 of the Securities Act of 1933 for alleged false and misleading registration
statements and prospectus supplements filed with the Commission between January
2006 and March 2007.



Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related
Transactions.

The information regarding this Item has been previously filed in a 424(b)(5)
filing dated April 2, 2007, Commission File Number 333-130192-37, CIK Number
0001393877.



Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.

The reports on assessment of compliance with the servicing criteria for
asset-backed securities and the related attestation reports on such assessments
of compliance are attached hereto under Item 15.



Item 1123 of Regulation AB, Servicer Compliance Statement.

The servicer compliance statements are attached hereto under Item 15.



                               Part IV

  Item 15. Exhibits, Financial Statement Schedules.

  (a) Exhibits.

  (4) Instruments defining the rights of security holders.

    4.1 Pooling and Servicing Agreement (filed as an exhibit to Form 8-K on
    April 13, 2007, Commission File Number 333-130192-37, CIK Number
    0001393877, and incorporated by reference herein).

    4.2 Trust Agreement (filed as an exhibit to Form 8-K/A on March 20,
    2008, Commission File Number 333-130192-37, CIK Number 0001393877,
    and incorporated by reference herein).

  (10) Incorporated by reference as Exhibit (4).

  (31) Rule 13a-14(d)/15d-14(d) Certification.

  (33) Reports on assessment of compliance with servicing criteria for
  asset-backed securities.


    <TABLE>
    
      <c>

    33.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    33.2 Countrywide Home Loans Servicing LP as Servicer
    33.3 JPMorgan Chase Bank, N.A. as Named Servicer
    33.4 JPMorgan Chase Bank, N.A. as Custodian
    33.5 The Bank of New York Trust Company, National Association as Custodian
    33.6 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    33.7 Wells Fargo Bank, N.A. as Paying Agent

    </TABLE>


  (34) Attestation reports on assessment of compliance with servicing criteria
  for asset-backed securities.


    <TABLE>
    
      <c>

    34.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    34.2 Countrywide Home Loans Servicing LP as Servicer
    34.3 JPMorgan Chase Bank, N.A. as Named Servicer
    34.4 JPMorgan Chase Bank, N.A. as Custodian
    34.5 The Bank of New York Trust Company, National Association as Custodian
    34.6 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.7 Wells Fargo Bank, N.A. as Paying Agent

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    35.2 Countrywide Home Loans Servicing LP as Servicer
    35.3 JPMorgan Chase Bank, N.A. as Named Servicer
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>


   (b) Exhibits identified in paragraph (a) above.

   (c) Omitted.



                          SIGNATURES


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


   J.P. Morgan Mortgage Trust 2007-S1
   (Issuing Entity)

   /s/ John Lingenfelter
   John Lingenfelter, Vice President
   (senior officer in charge of the servicing function of the master
   servicer)

   Wells Fargo Bank, N.A.
   (Master Servicer)


    Date:   March 28, 2008



  Exhibit Index

  Exhibit No.


   (4) Instruments defining the rights of security holders.

     4.1 Pooling and Servicing Agreement (filed as an exhibit to Form 8-K on
     April 13, 2007, Commission File Number 333-130192-37, CIK Number
     0001393877, and incorporated by reference herein).

     4.2 Trust Agreement (filed as an exhibit to Form 8-K/A on March 20,
     2008, Commission File Number 333-130192-37, CIK Number 0001393877,
     and incorporated by reference herein).

   (10) Incorporated by reference as Exhibit (4).

   (31) Rule 13a-14(d)/15d-14(d) Certification.

   (33) Reports on assessment of compliance with servicing criteria for
   asset-backed securities.


    <TABLE>

    
      <c>
    33.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    33.2 Countrywide Home Loans Servicing LP as Servicer
    33.3 JPMorgan Chase Bank, N.A. as Named Servicer
    33.4 JPMorgan Chase Bank, N.A. as Custodian
    33.5 The Bank of New York Trust Company, National Association as Custodian
    33.6 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    33.7 Wells Fargo Bank, N.A. as Paying Agent

    </TABLE>

   (34) Attestation reports on assessment of compliance with servicing
   criteria for asset-backed securities.


    <TABLE>

    
      <c>
    34.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    34.2 Countrywide Home Loans Servicing LP as Servicer
    34.3 JPMorgan Chase Bank, N.A. as Named Servicer
    34.4 JPMorgan Chase Bank, N.A. as Custodian
    34.5 The Bank of New York Trust Company, National Association as Custodian
    34.6 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator
    34.7 Wells Fargo Bank, N.A. as Paying Agent

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 Chase Home Finance LLC as Sub-Servicer for JPMorgan Chase Bank, N.A.
    35.2 Countrywide Home Loans Servicing LP as Servicer
    35.3 JPMorgan Chase Bank, N.A. as Named Servicer
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Securities Administrator

    </TABLE>