本研究欲探討在中國大陸審計市場中，會計師事務所產業專精度對於審計品質之影響，並進一步研究不同城市層級之產業專精度對於審計品質有無差別。 研究結果顯示，在產業專家以特定產業客戶在會計師事務所客戶組合中所佔比率之定義下，無法發現由產業專家會計師事務所查核之公司，其審計品質較佳；但進一步考慮城市層級因素後，實證結果發現城市會對產業專精度造成影響，支持假說二，審計品質較佳。造成此結果之可能係因掛靠制度及政府之尋租行為所造成中國審計市場分割與分散特性，且使得上市公司對事務所的選擇並不重視其審計品質的高低，而是更看重會計師事務所的掛靠單位，使得中國會計師事務所無法發展整體之產業專家。 / The objective of this thesis is to examine whether auditor’s industry specialization at the city-level affects the audit quality in China. In addition, we classify industry auditor expertise at the city level into the following two groups, and further investigate whether the association between industry expertise and audit quality differs between these two groups: (1) Directly Controlled Municipalities or locations of Stock Exchange (therefore DCM); (2)non-Directly Controlled Municipalities or non locations of Stock Exchange (non-DCM). The empirical results find no statistically significant association between audit quality and industry specialization at the city level in China. However, the results document that the association between industry expertise and audit quality are more pronounced for the DCM group than for the non-DCM, consistent with our prediction.