This mechanism is more conducive to the improvement of affordable housing recycling, save social resources, maximize the use of good housing resources through restructuring of public rental housing, low-rent housing and affordable housing re-transfer system, limiting the scope of circulation, establish appropriate exit mechanism, improve the protection of people's income tracking and monitoring system, setting out the conditions, and improve the transparency of the operation of illegal acts to increase penalties, and gradually establish a credit system of affordable housing, for the initiative to withdraw social housing system rental households to give some preferential policies, to provide low-interest home loans home buyers, home buyers tax cuts and exemptions.