More and more PPP projects have entered the implementation stage in 2021，while raising construction funds has becoming the restricting factor for PPP projects. The financing of PPP projects in Some districts and county-level areas is more difficult and the overall financing availability rate of PPP projects is low. Sector 1 focuses on the relevant policies and financing environment of PPP. Under the background of curbing implicit debt and preventing financial risks，PPP market and financing are affected to some extent. Sector 2 focuses on the main financing methods of PPP projects，and points out that medium and long-term loan of commercial banks has always been the main financing method，the bond financing of PPP projects has developed steadily，and the policy system of PPP securitization has basically formed. In 2021，the issuance of PPP securitization has increased，and the types of underlying assets have diversified. PPP funds gradually cool down，while the issue of infrastructure REITs is progressing well. Sector 3 analyzes the problems existing in PPP financing and puts forward corresponding suggestions.