<DOCUMENT>
<TYPE>6-K
<SEQUENCE>1
<FILENAME>sinovac6k083104.txt
<DESCRIPTION>SINOVAC BIOTECH LTD. 6K, 08.31.04
<TEXT>






                                  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 August, 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-
                                    ------



<PAGE>






INDEX
-----

Item
----

1.   Press Release dated August 9, 2004 - Exhibit 99.1
2.   Press Release dated August 11, 2004 - Exhibit 99.2
3.   Press Release dated August 13, 2004 - Exhibit 99.3
4.   Press Release dated August 30, 2004 - Exhibit 99.4

Item 1. Press Release dated August 9, 2004 - Exhibit 99.1
---------------------------------------------------------

Item 2. Press Release dated August 11, 2004 - Exhibit 99.2
----------------------------------------------------------

Item 3. Press Release dated August 13, 2004 - Exhibit 99.3
----------------------------------------------------------

Item 4. Press Release dated August 30, 2004 - Exhibit 99.4
----------------------------------------------------------




                                   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:  September 15, 2004                           By:  /s/ Weidong Yin
                                                        ------------------------
                                                         Weidong Yin, CEO and a
                                                         Director



<PAGE>








                                  EXHIBIT INDEX


Number     Exhibit                                    Sequential Page Number
------     -------                                    ----------------------
 99.1      Press Release dated August 9, 2004                    4
 99.2      Press Release dated August 11, 2004                   7
 99.3      Press Release dated August 13, 2004                   9
 99.4      Press Release dated August 30, 2004                  11



</TEXT>
</DOCUMENT>
