Abstract: Since 2014, the government has strongly advocated the cooperation between government and social capital (PPP), making it one of the core tools to improve the performance of the supply system and to realize the more flexible and extensive modern governance with the guidance of the system supply of the supply side. To date, the attention of PPP has been focused mainly on such levels as management, financing, efficiency and technical aspects in the framework of economics, while such social governance elements as fairness and justice, public interests, state responsibility and public participation under the framework of politics are not sufficiently and extensively discussed. PPP is a risk sharing and revenue sharing all-win mechanism between the government, social capital and the third party specialist agencies, butt jointing the market and matching the public policy, which is conductive to seeking the progressive maximization of public interests. As a kind of partner relationship management tools, PPP can introduce social capital to cooperate with the government, so as to jointly bear the state responsibility, promote more adequate public participation, make public services more responsive and more beneficial to the people, which can better realize the public interests.

Key words: vcooperation between government and social capital; public interest; state responsibility; public governance