# SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K/A(Amendment No. 1)

# (Mark One)

# xANNUAL REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE
ACT OF 1934

# For the fiscal year ended
October 1, 2005

# OR

# oTRANSITION
REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT
OF 1934

# For the Transition Period from _____________ to ______________

# Commission File No.
0-2382

MTS SYSTEMS CORPORATION
(Exact Name of
Registrant as Specified in its Charter)

|Minnesota                                |  | 41-0908057          | 
|---------------------------------------- |  | ------------------- | 
|                                         |  |                     | 
|(State or other jurisdiction of          |  | (I.R.S. Employer    | 
|incorporation or organization)           |  | Identification No.) | 
|14000 Technology Drive                   | 
|Eden Prairie, MN                         |  | 55344               | 
|                                         |  |                     | 
|(Address of Principal Executive Offices) |  | (Zip Code)          | 

# Registrants
telephone number, including area code: (952) 937-4000

# Securities registered
pursuant to Section 12(b) of the Act: None

# Securities registered
pursuant to Section 12(g) of the Act: Common Stock, $.25 par value per share

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

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 o
  Nox

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
  Noo

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

Indicate by check mark whether the
registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act):
   Yes x
  Noo

Indicate by check mark
whether the registrant is a shell company (as defined in Rule 12b-2 of the
Exchange Act):
   Yes o
  Nox

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 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: $564,933,286.

As of December 7, 2005, the
registrant had outstanding 19,403,474 shares of Common Stock.

# DOCUMENTS INCORPORATED
BY REFERENCE: None

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# Explanatory Note

On December 14, 2005, MTS Systems
Corporation filed its Annual Report on Form 10-K for the fiscal year ended October 1,
2005. This Amendment No. 1 has been filed to correct an error in the filed versions of
Exhibits 31.1 and 31.2. While the manually executed Certifications of the Chief Executive
Officer and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of
2002 were as reflected in the Exhibits 31.1 and 31.2 to this Amendment No. 1, certain
language regarding internal control over financial reporting was omitted from the
introductory portion of paragraph 4 of the initially filed exhibits. There are no changes
to the original Form 10-K other than those outlined above. This Form 10-K/A does not
reflect events occurring after the filing of the original 10-K, or modify or update
disclosures therein in any way, other than as outlined above. The exhibits as originally
executed follow.

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# PART IV

# Item 15. Exhibits and
Financial Statements Schedules.

The
following documents are filed as part of this report:

| | (3)
  Exhibits:
| | ---------------

|ExhibitNumber | Description                                                                                                             
|------------- | ------------------------------------------------------------------------------------------------------------------------
|             
|31.1          | Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley
Act of 2002 (Filed herewith).
|             
|31.2          | Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley
Act of 2002 (Filed herewith).
|             

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# SIGNATURES

Pursuant to the requirement 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.

| |                                                                      |                         |                            |  | 
| | -------------------------------------------------------------------- | ----------------------- | -------------------------- |  | 
| |                                                                      | MTS SYSTEMS CORPORATION
| | By:                                                                  |                         | /s/   Sidney W. Emery, Jr. | 
| |                                                                     
| | Sidney W. Emery, Jr.
Chairman, Chief Executive Officer and President |                        

Date:  January 24, 2006

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