The western legitimacy theories roughly includes three main schools,they are normal legitimacy theory and empirical legitimacy theory which have obviously tension,and the rebuilding legitimacy theory of Jǚrgen Habermas,who tried to dissolve the tension between the two schools mentioned above.

The current international housing rebuilding policies after disaster has been shifted from housing construction and solving the problem of residence to comprehensive reconstruction and has formed an integrated reconstruction system which coordinates various reconstruction methods: public housing rebuilding,personal reconstruction,the community reconstruction and the permanent simple housing,etc.