Most small to medium size FIEs prefer to their accounts being audited by an accounting firm with international standards expertise with a reasonable fee.
In addition, in view of the complexity of China tax regulations, foreign investors should keep themselves being updated with any new rules and the modifications to existing regulations. Your auditor should be able to demonstrate a commitment to and depth of knowledge of these new rules.
Last but not least important, your auditor should be familiar with the best practise of international business and willing to catch up the rapid pace of a changing business environment. Thus, they will act as not only your auditor, but also a business advisor.