Based on the data of A share listed companies in China stock market from 2008 to 2013, this paper empirically tests the effect of auditor reputation on accounting conservatism，as well as the different impact of auditor reputation on accounting conservatism under different ownership. The study finds that auditor reputation significantly improves the level of accounting conservatism，furthermore, compared with non-state-owned enterprises, accounting conservatism is higher in state-owned enterprises, that non-state-owned companies employing high reputation auditors have a positive impact on accounting conservatism, while the effect of state-owned companies employing high reputation auditors on accounting conservatism is not obvious, that compared with the effect of state-owned listed companies, the effect of non-state-owned enterprises employing high reputation auditors on accounting conservatism is not significant. The conclusions of this paper is to provide some empirical data for further improvement of corporate governance and auditor reputation.