154



                                  EXHIBIT 10.11
                                  -------------



           This is an Exhibit to the Form 20-F of Sinovac Biotech Ltd.
           -----------------------------------------------------------


                     Attached find the following materials:


        Corporate Services Agreement entered into between the Company and
        -----------------------------------------------------------------
          Segue Ventures LLC, dated for reference effective May 1, 2005
          -------------------------------------------------------------










                                       155




                               CORPORATE SERVICES
                               ------------------
                                    AGREEMENT
                                    ---------


       THIS  CORPORATE  SERVICES  AGREEMENT  is made  and  dated  for  reference
       ------------------------------------
effective (the "Effective Date") as of the 1st day of May, 2005.

BETWEEN:
- -------

              SEGUE  VENTURES  LLC.  having its address for delivery and service
              ---------------------
              located at 203 Windsor Avenue, Melrose Park, PA 19027-3510

              (the "Consultant");

                                                               OF THE FIRST PART
                                                               -----------------

AND:
- ---

              SINOVAC BIOTECH LTD. a company duly incorporated under the laws of
              --------------------
              Antigua and having an address for delivery and service  located at
              No. 39 Shangdi Xi Road, Haidian District, Beijing, P.R.C 100085

              (the "Company");

                                                              OF THE SECOND PART
                                                              ------------------

              (the Consultant and the Company being hereinafter  singularly also
              referred  to as a  "Party"  and  collectively  referred  to as the
              "Parties" as the context so requires)


WHEREAS:
- -------

A.     The Company is in the medical business (the "Business") of developing and
marketing vaccines in China and is listed on the AMEX;

B.     The Company retains the Consultant under this agreement (the "Agreement")
to act  as  the  Company's  Investment  Relations  Manager.  Its  purpose  is to
establish  and execute an effective,  combined IR - PR strategy that  powerfully
communicates Sinovac's qualities and potential to the investment community.  The
Consultant's goal is to help achieve and maintain  favorable market  valuations,
stable stock price and relations with the investment and media communities.


       NOW THEREFORE THIS AGREEMENT  WITNESSETH THAT THE PARTIES HERETO AGREE AS
       -------------------------------------------------------------------------
FOLLOWS:
- -------






                                       156



                                    Article I
                                    ---------

                 SERVICES AND RESPONSIBILITIES OF THE CONSULTANT
                 -----------------------------------------------

1.1    Consultant  Services.   The Consultant will provide to the Company, as an
       --------------------
independent consultant,  on a non-exclusive basis, the services ("Services") set
forth below together with such reasonable additions and modifications thereto as
the Company may request from time-to-time:

       A.     Investor Relations - Conduct day-to-day  investor relations ("IR")
              operations for the Company including:

              a.     Manage a toll free investor relations  information line and
                     provide   response   services  in  a  professional   manner
                     compliant  with SEC and  stock  exchange  regulations  that
                     Sinovac is a member of;
              b.     Draft  Company  press  releases  for  approval  by  Company
                     management;
              c.     Assist  in the  preparation  and  distribution  of  Company
                     information brochures and other media material;
              d.     Prepare for Company  approval  strategic  IR plans for cost
                     effective  and  market  effective  news  dissemination  and
                     public  awareness  programs and programs to enhance Company
                     stockholder base and distribution;
              e.     Coordinate conference calls & web-casts for North America;
              f.     Prepare for Company approval,  an investment awareness plan
                     that identifies contacts at investment  institutions likely
                     to find Sinovac interesting and develop media material that
                     introduces potential investment and financial  institutions
                     to Sinovac. ;
              g.     Provide   shareholders   with   latest   news  and  Company
                     information releases;
              h.     Provide strategic counsel on investor  relations' issues to
                     senior management  including  feed-back on investor Company
                     knowledge;
              i.     Track market and Sinovac  shareholder  activity and prepare
                     analysis concerning trends and significance to the Company;
                     and
              j.     Assist in preparing statements and commentary for SEC forms
                     and reports.

       B.     Website Management - Assist Sinovac with its website as follows:

              a.     Prepare basic website content,  monitor website for content
                     currency and update as necessary;
              b.     Prepare  for  website  -  annual  reports,  news  releases,
                     Frequently  Asked Questions  (FAQs) section,  links section
                     and other published content;

       C.     Strategic Media Relations

              a.     Establish and maintain  contacts  with suitable  reporters,
                     editors, key journalists and other media;
              b.     Provide analysis of media coverage, journalist profiling;
              c.     Provide  strategy-driven   corporate  media  communications
                     programs; and
              d.     Cultivate investor relations networks.

       D.     Cultivate Capital Markets and Shareholder Relations







                                       157



              a.     Produce  targeted  programs  to identify  and connect  with
                     qualified  institutional  investors. Be prepared to provide
                     personal  and  telephone  briefings  to  the  institutional
                     investment  community  in order to  present  the  Company's
                     benefits to investors and to establish positive  productive
                     business relationships;
              b.     Assist  the  Company  with   preparation   of   information
                     presentations    and   documents    appropriate   for   the
                     institutional    investment    community    and   financial
                     institutions to become knowledgeable about the Company;
              c.     Establish and enhance channels of communication between the
                     Company  and   institutional   investors,   market  makers,
                     registered  representatives,  buy-and  sell-side  financial
                     analysts, and portfolio managers; but
              d.     Consultant's    responsibilities   do   not   include   the
                     solicitation or sales of securities.

       E.     Road Show Public Relations / Promotion

              a.     Prepare  and present  multimedia  briefing  strategies  and
                     assist in planning speaking agendas and venues; and
              b.     Provide  coaching and  assistance  to Sinovac  officers for
                     public speaking.

       F.     Opinion  Research - conduct  polls and  targeted  interviews  with
              investors  and the  investment  community to  determine  Company's
              message penetration and effectiveness.

       G.     Support Business Plan Development and Execution

              a.     Marketing   and  business   plans  -  assist  in  providing
                     information,  validating and improving ideas, trouble shoot
                     logic flaws and provide research support;
              b.     Corporate  Governance - facilitate  informing the public of
                     the Company's corporate  governance programs and events and
                     develop and execute an information disclosure program;
              c.     Message  Development - develop a systematic message process
                     to help the  Company  focus  its  strategic  communications
                     objectives  and frame  effective  messages to achieve them;
                     and
              d.     Executive Coaching:

                     i.     Media  Coaching  to  improve  individual  skills  in
                            dealing  with the news media and for general  public
                            communication; and
                     ii.    Presentation Skills to help develop skills in speech
                            delivery and conducting meetings.

(such above-referenced services being, collectively, also called the "Consulting
Services").

1.2    Reporting By Consultant.   The Consultant will report to the Company on a
       -----------------------
timely basis as to its activities and performance in its conduct of the Services
and any issues which arise.  The  Consultant  shall report as soon as reasonably
possible in respect to material  matters and shall  render  summary  reports not
less than monthly.







                                       158



                                   Article II
                                   ----------

                    INFORMATION TO BE PROVIDED BY THE COMPANY
                    -----------------------------------------


2.1    Information to be made available.    The Company agrees to make available
       --------------------------------
to the Consultant all corporate,  financial and operating  information  which is
reasonably  necessary  and  sufficient  to allow the  Consultant  to perform the
Consulting Services.  The Company agrees to make all such information  available
to  the  Consultant  and  hereby  authorizes  the  Consultant  to  provide  such
information to investors, potential investors, registered representatives, legal
and  accounting  advisers,  and  other  persons,   subject  to  such  reasonable
conditions and  restrictions  as the Company deems  necessary or appropriate and
subject to insider  information rules and restrictions.  The Consultant will use
such  information only for the purposes set out herein and for no competitive or
other purpose whatsoever.

2.2    Accuracy of the information.   The Company  agrees that it will bear sole
       ---------------------------
responsibility for the accuracy and completeness of the information  provided to
the  Consultant,  information  created by the  Consultant  and  approved  by the
Company,  but not for information created and released by the Consultant without
the approval of the Company.

2.3    Material  change  in  information.   The Company  agrees  to  advise  the
       ---------------------------------
Consultant  promptly of any material  change in the affairs of the Company or in
any  information  provided  to the  Consultant  from  the  date  at  which  such
information is given.


                                   Article III
                                   -----------

                              COMPLIANCE WITH LAWS
                              --------------------


3.1    Consultant Compliance Issues and Insurance.   The Consultant shall comply
       ------------------------------------------
with all laws, whether federal or state,  applicable to the Consulting  Services
and, when  requested by the Company,  will advise the Company of any  particular
compliance  issues  affecting any Consulting  Services or transactions for which
the Consultant's  services have been engaged.  The Consultant will engage in its
own name liability  insurance  coverage for its activities which will be charged
as an expense to the  Company,  subject to Company  approval  which shall not be
unreasonably with held. It is presently contemplated that the Consultant will be
able to acquire  insurance  of  $1,000,000,  with a $10,000  deductible,  for an
estimated  annual  premium of  approximately  $9500,  which is acceptable to the
Company.

3.2    Professionals.   The fees and disbursements of counsel and accountants in
       -------------
regard to the  Consulting  Services  will be paid for by the Company  subject to
prior approval by the Company.

3.3    Company Information Security.   The  Consultant  shall effect  and comply
       ----------------------------
with all reasonable  endeavors to ensure that it affords security to information
of the Company and that the Consultant,  or any persons with whom the Consultant
works or with  whom the  Consultant  deals,  do not  employ  information  of the
Company in any manner contrary to law or fiduciary obligations.

3.4    Company  Compliance Issues.   The  Company  shall  comply  with all laws,
       --------------------------
whether federal or state, applicable to the Consulting Services and the Company.






                                       159



The Company shall effect  commercially  reasonable best efforts to continue as a
reporting  issuer  in good  standing  in the US on the  AMEX or  another  public
exchange.

3.5    Trading.  In the event that the  Consultant,  or any person with whom the
       -------
Consultant  works or with whom the  Consultant  deals,  trades in the  Company's
market then the Consultant shall employ  reasonable  prudence as to such trading
and shall effect such in compliance with law. Any trading shall be effected in a
manner  which  does  not  damage  market  stability  and  orderliness  and is in
compliance with insider knowledge laws.


                                   Article IV
                                   ----------

                                      TERM
                                      ----


4.1    Term.   The initial term of this Agreement is from the Effective  Date to
       ----
July 30, 2005 (the "Initial  Term").  After the Initial Term,  and provided that
neither Party gives notice of  termination  by July 30, 2005 this Agreement will
renew for a one year period  ending July 30,  2006 unless  terminated  by either
Party, without any requirement for the giving of any cause for such termination,
upon 60 days'  prior  written  notice (the entire  period of this  Agreement  to
termination being the "Term").


                                    Article V
                                    ---------

                         COMPENSATION OF THE CONSULTANT
                         ------------------------------


5.1    Compensation to the Consultant.   The Consultant shall be compensated for
       ------------------------------
the Consulting Services and its costs as follows:

       (a)    $10,000.00  per month,  payable  on the 1st day of the  month,  in
              advance; and

       (b)    subject to the Term continuing  (effective July 30th, 2005) 15,000
              restricted  shares  awarded on August  1st,  2005 and  options for
              28,000 shares of stock with an exercise  price of $2.40 per share,
              vesting on August 1st, 2005 and expiring July 31st, 2010.

5.2    Reimbursement  of Expenses.   During the Term the Company shall reimburse
       --------------------------
the Consultant for all invoiced and substantiated expenses properly incurred for
the  Consulting  Services  within 15 days of invoice.  The Company  shall not be
responsible for expenses unless it has given approval as follows:

       (i)    Any single expense in excess of $500; and

       (ii)   Any month in which it is anticipated that aggregate  expenses will
              exceed $2000.

5.3    Ownership of  Clientele.   The Consultant  agrees that all work  product,
       -----------------------
market data,  investor leads and  identities,  institutional  data and all other
information  generated  by the  Consultant  for the  purposes of the  Consulting
Services and all data acquired from the Company  (collectively the "Confidential
Information")  are the  property of the  Company and shall be kept  confidential
except as permitted or required by this  Agreement or as otherwise  permitted in
writing. Such Confidential Information shall remain confidential and not used by
the  Consultant  until the same has become  public as to Company  data and for a






                                       160



period  of  one  (1)  year  as  to  investor  or  institutional  data  following
termination  of  this  Agreement,  subject  to  any  extension  of a  continuing
transaction  right  in  regard  to  incomplete   transactions  completing  after
termination  of this  Agreement,  as  elsewhere  herein  provided.  This  within
provision is a perpetuating guarantee, for the period stated, and applies to any
and all transactions entertained by the Parties, including subsequent follow-up,
repeat transactions,  extended or renegotiated  transactions,  as well as to the
initial  transaction,  regardless of the success of the project.  This provision
does not prejudice the  Consultant or the Company from  continuing  relations or
business  with  parties  to whom they have been  introduced  during the Term and
conducting  business with such parties for their own account but the  Consultant
shall not make the Company's Confidential Information available to third parties
or distract the investors in a manner which may compete with or damage the value
of  the   Company's   Confidential   Information   or  its   finance  or  market
possibilities.


                                   Article VI
                                   ----------

                       INFORMATION AND ADVICE CONFIDENTIAL
                       -----------------------------------


6.1    Confidential   Information.   No  information   furnished   hereunder  in
       --------------------------
connection with any transaction or the Consulting Services shall be published by
any Party without the prior written consent of the other Party, but such consent
in respect of the reporting of factual data shall not be unreasonably  withheld,
and shall not be  withheld  in respect of  information  required  to be publicly
disclosed pursuant to applicable securities or other applicable laws.


                                   Article VII
                                   -----------

                      INDEMNIFICATION AND LEGAL PROCEEDINGS
                      -------------------------------------


7.1    Indemnification.   Subject to section  7.2  below,  each Party  agrees to
       ---------------
indemnify and save the other,  its  affiliates and their  respective  directors,
officers,  employees and agents (each an "Indemnified  Party") harmless from and
against  any and all  losses,  claims,  actions,  suits,  proceedings,  damages,
liabilities   or  expenses  of   whatsoever   nature  or  kind,   including  any
investigation   expenses  incurred  by  any  Indemnified   Party,  to  which  an
Indemnified Party may become subject by reason of breach of this Agreement or of
law by the defaulting Party.

7.2    Consultant  Liability.   The Consultant shall not be liable in respect of
       ---------------------
any act or omission committed by it, and the Company or its personnel shall have
no claim against the Consultant,  of any nature whatsoever  whether in contract,
tort or  otherwise  in  respect  of any  act or  omission  arising  out of or in
connection  with the  provision  of the  Services  except where such arises as a
consequence of willful wrongs or gross negligence.  Except for willful wrongs or
gross  negligence,  the  Consultant  shall not be liable to the  Company  or its
personnel for:

       (a)    Any loss or damage  (except death or personal  injury arising from
              the negligence of the Consultant)  arising from any  inaccuracies,
              omissions,  data  loss,  faults  or  delays  arising  out  of  the
              Consultant   Services,   no  matter  how  such   faults,   delays,
              inaccuracies, omissions or losses may arise or







                                       161



       (b)    Any loss or failure to perform any obligation under this agreement
              due to causes beyond its reasonable control including,  industrial
              disputes,  supplier  failure,  fire,  power or  telecommunications
              failure.

In no circumstance, subject to section 7.2 above, shall the Consultant be liable
for any direct or indirect  financial loss, or consequential loss or damage with
respect to the Consultant Services.


                                  Article VIII
                                  ------------

                                  FORCE MAJEURE
                                  -------------


8.1    Events.   If either Party  hereto is at any time  during  this  Agreement
       ------
prevented  or delayed in  complying  with any  provisions  of this  Agreement by
reason of strikes,  walk-outs,  labour shortages, power shortages,  fires, wars,
acts of God, earthquakes,  storms, floods,  explosions,  accidents,  protests or
demonstrations  by  environmental  lobbyists or native rights groups,  delays in
transportation,  breakdown of machinery, inability to obtain necessary materials
in the  open  market,  unavailability  of  equipment,  governmental  regulations
restricting  normal  operations,  shipping delays or any other reason or reasons
beyond the control of that Party,  then the time limited for the  performance by
that Party of its  obligations  hereunder  shall be extended by a period of time
equal in length to the period of each prevention or delay.

8.2    Notice.   A Party shall within seven calendar days give written notice to
       ------
the other Party of each event of force majeure  under  section 8.1  hereinabove,
and upon  cessation  of such event shall  furnish the other Party with notice of
that  event  together  with  particulars  of the  number  of days by  which  the
obligations  of that Party  hereunder have been extended by virtue of such event
of force majeure and all preceding events of force majeure.


                                   Article IX
                                   ----------

                             DEFAULT AND TERMINATION
                             -----------------------


9.1    Default.   If either of the Parties is in default with  respect to any of
       -------
the provisions of this  Agreement  (hereinafter  referred to as the  "Defaulting
Party"),   the   non-defaulting   Party   (hereinafter   referred   to  as   the
"Non-Defaulting  Party") shall give notice to the Defaulting  Party  designating
such  default,  and within  fifteen (15) business days after its receipt of such
notice, the Defaulting Party shall either:

       (a)    cure such default, or diligently commence proceedings to cure such
              default and prosecute the same to completion  without undue delay,
              with notice to the  Non-Defaulting  Party of the procedures it has
              instigated to cure; or

       (b)    give the  Non-Defaulting  Party  notice  that it denies  that such
              default has  occurred  and that it is  submitting  the question to
              arbitration  in  accordance  with  the  arbitration  rules  of the
              American Arbitration  Association.  Arbitration shall be conducted
              by a single  arbitrator  selected mutually by the Parties (failing
              which they shall each  select one and decide  which acts by a flip
              of a coin),  the arbitrator  shall  determine rules of conduct and
              all  decisions  of  the  arbitrator   shall  be  final,   binding,
              unappealable and may be entered by the winning Party in court as a






                                       162



              judgement, and each Party shall bear their own legal costs and pay
              50% of the arbitration costs.

9.2    Termination.  If  default  is not  addressed  appropriately  in the  form
       -----------
required by 9.1(a) above, or cured within 15 days of an arbitrator's  finding of
default of 9.1(b), then the Non-Defaulting Party may terminate this Agreement at
any time,  without  prejudice  to any  claims it may have for an  accounting  or
damages.


                                    Article X
                                    ---------

                                     NOTICE
                                     ------


10.1   Notice.  Each notice, demand or other communication required or permitted
       ------
to be given under this  Agreement  shall be in writing and shall be delivered to
the other  Party,  at the address for such Party  specified  above.  The date of
receipt of such written notice,  demand or other communication shall be the date
of delivery  thereof.  Notice  shall be sent via major  international  overnight
carrier service (eg. FedEx, UPS, DHL) to the following addresses:

SEGUE VENTURES, LLC
C/O MR. CRAIG H. BIRD
203 WINDSOR AVE
MELROSE PARK, PA 19027-3510

COURTESY COPY TO LEGAL COUNSEL OF MR. BIRD:
ATTN: CHARLES BASCH ESQ.
400 GREENWOOD AVE
WYNCOTE, PA 19095

SINOVAC BIOTECH LTD.
C/O DR. WEI DONG YIN
NO. 39 SHANGDI XI ROAD,
HAIDIAN DISTRICT, BEIJING, P.R.C 100085








                                       163



COURTESY COPY TO LEGAL COUNSEL OF SINOVAC BIOTECH LTD:
ATTN: PETER JENSEN
DEVLIN JENSEN, LAWYERS
2550-555 WEST HASTINGS STREET,
VANCOUVER, BC V6B 4N5


10.2   Change  of  Address.  Either  Party may at any time and from time to time
       -------------------
notify the other  Party in writing of a change of address and the new address to
which notice shall be given to it thereafter until further change.


                                   Article XI
                                   ----------

                               GENERAL PROVISIONS
                               ------------------


11.1   Entire Agreement.    This  Agreement  constitutes  the  entire  agreement
       ----------------
between  the Parties  hereto in respect to this  subject  matter and  supersedes
every  previous   agreement,   expectation,   negotiation,   representation   or
understanding,  whether  oral or  written,  express  or  implied,  statutory  or
otherwise,  between  the  Parties  with  respect to the  subject  matter of this
Agreement.

11.2   Enurement and Assignment.   This  Agreement will enure  to the benefit of
       ------------------------
and will be  binding  upon  the  Parties,  their  respective  heirs,  executors,
administrators and permitted  assigns.  This Agreement may not be assigned as to
any part by any Party without the permission in writing of the other Party, such
permission not to be unreasonably withheld.

11.3   Time of the Essence.   Time will be of the essence of this Agreement.
       -------------------

11.4   Applicable  Law.   The situs  of this  Agreement  is  Vancouver,  British
       ---------------
Columbia,  and for all purposes this Agreement  will be governed  exclusively by
and construed and enforced in accordance with the laws of such Province,  except
that the Pennsylvania Limited Liability Company Law shall apply.

11.5   Currency.   Unless otherwise  stated, all references in this Agreement to
       --------
currency shall be United States currency.

11.6   Severability and Construction.   Each  Article,  section, paragraph, term
       -----------------------------
and provision of this Agreement,  and any portion  thereof,  shall be considered
severable,  and if, for any reason,  any portion of this Agreement is determined
to be invalid,  contrary to or in conflict with any applicable present or future
law,  rule or  regulation  in a final  unappealable  ruling issued by any Court,
agency or tribunal  with valid  jurisdiction  in a proceeding to which any Party
hereto is a party,  that ruling shall not impair the  operation  of, or have any
other effect upon, such other portions of this Agreement as may remain otherwise
intelligible  (all of which shall remain  binding on the Parties and continue to
be given full  force and  effect as of the date upon  which the  ruling  becomes
final).

11.7   Counterparts.   This Agreement may be signed by the Parties  hereto in as
       ------------
many  counterparts as may be necessary,  each of which so signed shall be deemed






                                       164



to be an original,  and such counterparts  together shall constitute one and the
same instrument and notwithstanding the date of execution will be deemed to bear
the execution date as set forth on the front page of this Agreement.

11.08  No Partnership or Agency.  The Parties have not created a partnership and
       ------------------------
nothing  contained in this Agreement shall in any manner  whatsoever  constitute
any Party the partner,  agent or legal  representative  of the other Party,  nor
create any fiduciary  relationship  between them for any purpose whatsoever.  No
Party  shall have any  authority  to act for,  or to assume any  obligations  or
responsibility  on behalf of,  the other  Party  except as may be,  from time to
time,  agreed  upon in writing  between the  Parties or as  otherwise  expressly
provided.

11.09  Consents and Waivers. No consent or waiver expressed or implied by either
       --------------------
Party in respect of any  breach or  default by the other in the  performance  by
such other of its obligations hereunder shall:

       (a)    be valid  unless it is in  writing  and  stated to be a consent or
              waiver pursuant to this section;

       (b)    be relied  upon as a consent  to or waiver of any other  breach or
              default of the same or any other obligation;

       (c)    constitute a general waiver under this Agreement; or

       (d)    eliminate  or modify  the need for a  specific  consent  or waiver
              pursuant to this section in any other or subsequent instance.


       IN WITNESS  WHEREOF the Parties  hereto have hereunto set their hands and
       -------------------
seals in the presence of their duly authorized  signatories  effective as at the
date first above written.


SINOVAC BIOTECH LTD                         )
- --------------------                        )
by its authorized signatory                 )
                                            )
                                            )
         /s/ Weidong Yin                    )
- --------------------------------------------)
Authorized Signatory                        )


SEGUE VENTURES LLC.                         )
- -------------------                         )
by its authorized signatory:                )
                                            )
                                            )
         /s/ Craig Bird                     )
- --------------------------------------------)
Authorized Signatory                        )






                              End of Exhibit 10.11

                                   ----------