Informal property houses are built in rural collective lands and illegally sold to citizens.Although forbidden by laws，they develop rapidly and spread widely in the way of urbanization and suburbanization.Now informal property houses are a part of urban housing system and play a role in the livelihood housing.We must face up to the reality and break through stereotypes of land laws.The informal property houses should be legalized and incorporated into urban housing supply system for lower income citizens，similar to economically affordable houses.