China's urban housing security system has developed for years.The dual division between registered population and migrant population in cities still exists.While local governments undertake responsibility of the housing security through intergovernmental duty division,it is not appropriate because housing security is a kind of national income redistribution that belongs to the central government.From the perspective of the population mobility,the article discusses the problems of the current housing security system,based on which it proposes three recommendations for improving the existing housing security system.First,we should make a distinction between the national income redistribution carried out by the central government and the public services provided by local governments.The responsibility and fiscal expenditure of the local,provincial,and central government should be clearly defined.Second,intergovernmental fiscal transfer payment should be designed according to the population mobility status.Third,the housing security system should protect the demands of the new generation of peasant workers and migrant families.