Photovoltaic（PV）power generation can reduce the pollution of primary energy, meeting the demand of power demand side management in China. To solve financing problem in development of PV industry, public -private partnership（PPP）is adopted. Considering tradable green certificate market, investment evaluation of PPP PV power generation project under grid parity policy is analyzed. Firstly, cost model and price range of tradable green certificate under grid parity policy are constructed. Then, combined with characteristics of different PPP financing model, according to benefit model of project, an investment evaluation method for PPP PV power generation projects based on tradable green certificate market is proposed. Finally, case analysis shows that the choice of financing model has a great influence on investment decision. The green certificate market enables enterprises to make immediate investment decisions under the grid parity policy, thereby promoting the development of PV industry. In addition, policy suggestions for government on tradable green certificate market are presented.