Abstract:Abstract: the existing literature has carried out a lot of theoretical and empirical studies on corporate social responsibility and corporate performance, but there is little literature on the social responsibility of private technology enterprises Chinese transition mechanism how to influence the performance of enterprise. This study based on the sample data of Guangdong and Jiangxi two provinces of 320 private science and technology enterprises, the private science and technology enterprise social responsibility is divided into internal and external social responsibility social responsibility based on the empirical analysis of the relationship between the private science and technology enterprise social responsibility and corporate performance and test the mediating effect of enterprise horizontal social capital and social capital in the vertical between the two. Research shows that: the internal social responsibility of private technology enterprises horizontal social capital has a higher impact on enterprise performance, less influence of external social responsibility of private technology enterprises transverse higher social capital on enterprise performance. The social responsibility of private science and technology enterprises have vertical social capital rich the influence on enterprise performance, less influence on the performance of enterprises outside the social responsibility of private science and technology enterprise longitudinal higher social capital.