This paper used decision of the capital structure as the core, explore the process of corporate social responsibility and profitability affect it. In this paper, I used A-share listed companies from 2008 to 2012 years as a demonstration samples and found that higher the social responsibility is, higher the capital structure. After further studying the cross-impact of corporate social responsibility and profitability, I found among the enterprises which had same profitability, ones who take higher social responsibility had higher capital structure than ones who take low social responsibility. Besides, Social responsibility was found to have a negative impact on the capital structure of state-owned enterprises among the study on different ownerships.