Mainland China’s system of affordable housing provides housing for low and medium income groups. Housing for sale and housing for rent give residents two choices and also give two choices for municipal governments to provide affordable housing. affordable housing play a mono role in building and financing affordable housing, so they tend to build housing for sale rather than for rent to collect back investment in order to finance more housing units. However, rental housing is more affordable to residents in China. Municipal governments lack a way to liquefy these rental properties and attract private investment. On one hand, municipal governments hold a lot of rental properties worth billions of money; On the other hand, they still lack funding sources to finance new affordable rental housing. No liquidity has made municipal governments stuck with holding properties, and reduced their ability to build more public rental housing for low and medium income group.