It is the government's responsibility to solve the housing problems of low-income urban families with housing difficulties. In accordance with the spirit of Document No. 24 of the State Council and combined with its own actual conditions, Shanghai has solved the housing difficulties of low-income families by improving the low-rent housing system; established and improved the affordable housing system, and actively improved the housing conditions of low-and middle-income families. However, due to the fact that the existing housing supply system and housing security system are still not sound, there are still quite a number of groups with housing difficulties who have difficulty purchasing or renting commercial housing through the market. They neither have a housing supply that is compatible with their financial capabilities, and they cannot be incorporated into the existing housing security system for this group of people. This group mainly includes introduced talents, migrant workers in Shanghai and newly settled employees in the city. It should be noted that there are certain differences between this group and the current housing security system supply recipients in terms of household registration status, education level and skills, housing and income status. Because of this difference, we should consider solving their housing problems. The way they live should also be different: Non-registered population in this city means that people have a certain degree of mobility. For them, renting a house is more in line with the actual situation than buying a house. Especially for migrant workers coming to Shanghai, because of the strong mobility of work and low income levels, the requirements for a fixed residence are not very high; The introduced talents and newly settled employees in the city have mastered higher skills and relatively strong wealth accumulation capabilities. However, due to the lack of original accumulation, it is impossible to solve housing problems through market methods in the short term. It is necessary to rent housing to alleviate phased housing difficulties. In such circumstances, consideration should be given to providing housing supply methods suitable for these groups of people. Under Shanghai's existing housing supply system, their housing needs can be met mainly by developing public rental housing. Therefore, this research will mainly focus on the positioning, composition, and development of Shanghai's public rental housing system in the entire housing supply system and how to establish and improve the operating mechanism of public rental housing. The main contents and innovations of the study are as follows: 1. Shanghai's public rental housing is an important part of Shanghai's urban housing security system;2. The functions of Shanghai's public rental housing system are: the establishment of the public rental housing system will enable Shanghai to have two existing major housing supply systems from rigid mechanisms to flexible mechanisms. At the same time, public rental housing is an effective means to solve the housing difficulties of permanent residents;3. The supply of public rental housing in Shanghai is targeted at introducing talents, migrant workers coming to Shanghai, and household registration sandwich families including newly settled employees. 4. The housing sources of public rental housing should include: talent apartments, unit rental apartments, white-collar apartments, dormitories or apartments for migrant workers in Shanghai and social public rental housing;5. In terms of operating mechanism, raise housing through centralized construction (including allocation), renovation, transformation, acquisition, etc.; vigorously develop real estate investment trusts (REITs) to open up channels for funds for the public rental housing system; adopt market-oriented rent standards to determine rent levels; It mainly adopts a targeted supply mechanism to provide housing to units; implements a method linked to employers, and restricts tenants through employers to ensure the realization of rent collection and exit mechanisms; adheres to the principle of "urban areas join hands and districts are the main focus" and establishes a two-level management system to be responsible for the management of public rental housing. Three papers were published based on the topic and were cited many times. The research on the subject mainly reflects social benefits, and some of the results have been adopted by the "Implementation Opinions on the Development of Public Rental Housing in the City" formulated by relevant departments in Shanghai.