The research issues of corporate social responsibility (CSR) have been highly raising scholars' interests in the field of management. This study aims at exploring the intervening variables (social capital) which may mediate the relationship between CSR and CFP. Empirical data were collected from Taiwanese listed firms. According to the analysis of the regression analysis, evidence shows that social capital plays a mediating role on connecting CSR and corporate financial performance (CFP). The mechanism is that CSR first has a positive impact on the social capital and social capital subsequently produces a positive effect on CFP. 