In this paper, we take the 2008-2011 A shares listed corporations in Shenzhen and Shanghai Stock Exchange as the research samples, from four dimensions to build corporate governance composite index, using GLS model to measure the cost of equity capital, examing the relationship between corporate governance, accounting conservatism and the cost of equity capital. The empirical results show that corporate governance and the cost of equity capital have significantly negative correlation, accounting conservatism weakens the role of ...