Public rental housing refers to the affordable housing provided by the state with policy support and rented by various social subjects for low-and middle-income groups through new construction or other means. It is an important part of the national housing security system. Public rental housing is not owned by individuals, but by the government or institutions. Rent it to new employees at a price lower than the market price or affordable by the lessee, including some newly graduated college students and some groups who have moved from other places to work in cities.