In 2020，the global economy has been greatly affected by the COVID-19 epidemic. Since the beginning of the year，China has launched a series of policies to rebuild the economy，and ultimately achieve growth in unfavorable situations. As the real estate is faced with strict supervision，infrastructure investment is highly expected to stabilize the investment. PPP as the infrastructure investment model promoted by the central government during the recent years，has injected much vitality into the local economy but also encountered some development bottlenecks. Financing difficulty has become the key obstacle restricting the development of PPP market. General commercial and financial institutions prefer projects of short cycle and good economic benefits. However，PPP projects has long cycle and requires low capital cost. If completely relying on market-oriented financing，the high financing cost will transfer to the government and public. In this regard，it requires to consider the social benefit and economic benefit as well，which requires the joint efforts of the government and social capital. Meanwhile，development finance is often used in infrastructure and public services in developing countries around the world because of its policy implementation function. How to integrate the PPP and development finance is of practical significance to build better environment for PPP financing.