Exhibit 12.1
 CERTIFICATION OF OUR CHIEF EXECUTIVE OFFICER
  1.
    
    I have reviewed this annual report on Form 20-F of Siliconware Precision Industries Co., Ltd.
(the Company);
 2.
    
    Based on my knowledge, this report does not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period
covered by this report;
 3.
    
    Based on my knowledge, the financial statements, and other financial information included in
this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the Company as of, and for, the periods presented in this report;
 4.
    
    The Companys other certifying officer and I are responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and
15d-15(f)) for the Company and have:
 (a)
    
    Designed such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material information relating
to the Company, including its consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this report is being prepared;
 (b)
    
    Designed such internal control over financial reporting, or caused such internal control over
financial reporting to be designed under our supervision, to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements
for external purposes in accordance with generally accepted accounting principles;
 (c)
    
    Evaluated the effectiveness of the Companys disclosure controls and procedures and presented
in this report our conclusions about the effectiveness of the disclosure controls and
procedures, as of the end of the period covered by this report based on such evaluation; and
 (d)
    
    Disclosed in this report any change in the Companys internal control over financial
reporting that occurred during the period covered by this report that has materially affected,
or is reasonably likely to materially affect, the Companys internal control over financial
reporting.
 5.
    
    The Companys other certifying officer and I have disclosed, based on our most recent
evaluation of internal control over financial reporting, to the Companys auditors and the
audit committee of the Companys board of directors (or persons performing the equivalent
function):
 (a)
    
    All significant deficiencies and material weaknesses in the design or operation of internal
controls over financial reporting which are reasonably likely to adversely affect the
Companys ability to record, process, summarize and report financial information; and
 (b)
    
    Any fraud, whether or not material, that involves management or other employees who have a
significant role in the Companys internal controls over financial reporting.
  By:
    /s/ Chi-Wen TsaiName:
    Chi-Wen TsaiTitle:
    Chief Executive Officer