PPP (Public-Private Partnership), that is, public-private partnership, refers to the local government and social capital to build a public infrastructure financing mode. The advantage is that the introduction of market mechanisms into the infrastructure investment and financing can reduce the project and financial risks, also reducing government pressure. At the same time, the effective participation of the private sector can also promote innovation in project management, improving efficiency, and spread the latest management concepts and experience. The two sides can form a mutually beneficial common goal, with minimal cost to provide more and better services for the public.