This paper selected the non-financial A-share listed companies in Shanghai and Shenzhen from 2010 to 2015,and explored the effect of auditor industry expertise on the cost of debt financing.What's more,based on the differences of marketization environment in different regions,we also consider the property pattern and the quality of internal control to discuss the relation between auditor industry expertise and the cost of debt financing deeply.The result showed that the auditor's professional expertise has ...