By measuring social capital with indicators of trust, social associations density and blood donation rate, applying ordinary least squares method, and through the social capital contribution model, this study analyzes the contribution of social capital regional economic development, social development and environmental aspect. What is more. The results show as follows: In the provincial level, the distribution of social capital has not balance and has obvious regional difference. Social capital's contribution to regional development's three aspects is disparate in different region, also social capital's contribution to regional development's three aspects is disparate in the same region.