More and more limitations appear in traditional production factors that enhance the competitive advantages of firms. So the firms have to seek new points of economic growth. As an effective way to share corporate social responsibility（CSR），it is significant for corporation to make contributions. By adopting the theories of corporate philanthropy and competitive advantage and combining with the effects of corporate social capital，a concept model of characteristics of contribution-corporate social capital-competitive advantage for the firms is built. Then，through understanding the paths that the characteristics of contribution act on the competitive advantage of firms via corporate social capital，the mechanism of characteristics of contribution acting on competitive advantage of firms is elucidated，which tries to provide enterprises with an guideline about competition strategies.