Abstract: As PPP project can promote capital cooperation between public and private sector and share the risk of the two parties, it is highly popular in the construction of urban infrastructure. In the process of PPP project implementation, effective selection of reasonable social capital can greatly improve the operation efficiency, save the cost, and shorten the construction duration. According to the characteristics of water ecology comprehensive management of Zhoukou City of Henan Province, Public-Private-Partnership (PPP) is adopted in project implementation. A comprehensive evaluation index system of social capital partners based on the financial strength, technical ability, management ability, similar experience and reputation is established to evaluate the social capital from different sources by the method of multilevel fuzzy comprehensive evaluation. The entropy weight theory is introduced to the calculation of evaluation index weights to overcome the disadvantages of subjective assignment, so as to provide the basis for the pre-project decision-making.