Because of the disadvantage of interest game and the lacking of financial support, public housing security can't cover migrant workers in a short time. Low rate of return on investment also decides the shortage of the commodity house which conforms to the migrant workers' economic level. Based on the supply constraints of commodity housing and city public housing, this paper analyses the different subsidize' security effect to migrant workers' house purchasing and security effect of different means of intervention to migrant workers' housing lease. The conclusion is that, it is impossible that...