This article discusses housing security system in our society. From the society attribute this paper gives account of the housing security problem under the dif-ferent social conditions. The article ar-gues the critical roles of housing security system under the modern society. The paper also reviews the progress from wel-fare or public room to indemnificatory or affordable housing in China, and many essential characteristics are well analyzed. The study about urban indemnificatory housing with suitable crowd and its hous-ing component type becomes more and more vital problem which involves hous-ing security system in China, and the pa-per probes into suitable crowd and its housing component type.