UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                    FORM 6-K
                                    --------

       REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2004.

Commission File Number: 0-29031

                              SINOVAC BIOTECH LTD.
                       (Name of Registrant in its charter)

                               ANTIGUA and BARBUDA
         (State or other jurisdiction of incorporation or organization)

                               39 Shangdi Xi Road
                            Haidian District, Beijing
                                  China 100085
              (Address of principal executive offices and zip code)

                               Tel: 86-10-82890088
                               Fax: 86-10-62966910
                      (Issuer's telephone and fax numbers)

Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or Form 40-F

          Form 20-F  X            Form 40-F
                   -----                   -----

Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

          Yes                     No  X
             -----                  -----

If "Yes" is marked, indicate below the file number assigned to the registrant in
connection with Rule 12g3-2(b): 82-
                                   -----










INDEX
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Item
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1.   Press Release dated March 23, 2004 - Exhibit 99.1


Item 1. Press Release dated March 23, 2004 - Exhibit 99.1
---------------------------------------------------------




                                   SIGNATURES

Pursuant to the requirements 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.


                                            SINOVAC BIOTECH LTD.
                                            --------------------

Date:  April 2, 2004                        By:     "Wei Dong Yin"
                                                ------------------------------
                                                  Wei Dong Yin, President
                                                  and a Director











                                  EXHIBIT INDEX


Number            Exhibit                                Sequential Page Number
--------------    -----------------------------------    ----------------------
     99.1         Press Release dated March 23, 2004               4