From 2001,the system of urban subsidiary rental house is carried out in the six provinces of central China.

The existing researches have had a lot of reflections on why it is so slow for the urban low-rent-house policy to be carried out, however, a very important dimension has been ignored in these researches, that is the low-cost housing policy as a spatial politics.

Study on the system of low-rent housing providing in our country;

The Economic Analysis on Innovation of the Low-Rent Housing Institution in China;

Absence of government functions and defective system-design are thought to be the main causes for the low ebb into which affordable and low-rent housing has fallen.

In our country, ensuring policy of public housing came up with the reform of housing policy.

Public housing is defined as the social security function implemented by government and working unit in the housing field to supply the relatively cheap ordinary house for the families which have the lowest income and the registered permanent residence of town and city.

Through the study and exploring, the paper solves the problem of fund deficiency during the implementary of public housing system in Xi an under the premise of alleviating the financial pressure of government and solves several problems which exist in today s accumulation fund system in housing and provides theoretic basis for the work of government.