in 2021，China launched affordable rental houses to solve the housing difficulties of new citizens and young people in big cities. The form of affordable housing will have an important impact on improving the housing rental system to help new citizens and young people achieve the goal of housing. This paper focuses on the background，main contents，current implementation and the status of the actual housing system. On the one hand，the government has encouraged more market players to participate through a number of supporting policies，especially using the stock land and housing to increase supply，so as to reduce costs and promote the balance between jobs and housing. On the other hand，although the security lease planned to be constructed can cover most of the new demand and provide short-term and medium-term services，it is still mainly in the form of support rather than intermediate lease for the general new city residents and young people.