House property transaction is the main trading pattern in Chinese real estate market in recent 40 years，since reform and opening-up policy carrying out. People are encouraged to buy houses，after the gorverment did house reform in 1998；the everage house-ownership rate of the 40 provincial capitals and major cities was above 70% in1998. The contradiction of residential demand intensified in last decades，since the house-price shooting up with the urbanization process accelerating，more and more middle-low income communities could not afford house purchasing in major cities. It is necessary to develop housing rental markets in China，for securing the middle-low income communities residence demand and resolving the contradiction of real estate market.