CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER
PURSUANT TO SECTION 302 OF THE
SARBANES-OXLEY ACT OF 2002
  1.
    
    I have reviewed this annual report on Form 20-F of Hanwha SolarOne Co., Ltd.;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 annual report;4.
    
    The companys other certifying officer(s) 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 the
annual report that has materially affected, or is reasonably likely to materially
affect, the companys internal control over financial reporting; and
 5.
    
    The companys other certifying officer(s) 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 companys board of directors (or persons performing
the equivalent functions):
 (a)
    
    All significant deficiencies and material weaknesses in the design
or operation of internal control 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 control
over financial reporting.
 /s/ Gareth KungGareth KungChief Financial Officer
June 3, 2011