With the economic development and increase of population since the reform and opening-up，the problem of shortage of housing in China have become more and more serious. To deal with this problem，the Chinese government has begun to reform the welfare housing system which covers mainly employees of state-owned institutions and enterprises in urban areas by stopping the allocation of free housing and implementing a monetized public housing distribution system，and through the commercialization housing and promotion of the development of construction and housing industries，put to and end to the shortage of housing in a relatively short time period. At the same time，however，the government has failed to establish in a timely manner a system for the safeguarding of housing right of disadvantaged groups of the society. The construction of low-cost housing is far from satisfactory and the price of commercialized housing is rising all the time，resulting in serious problem of affordability of housing in China.