1.Introduction During the period of planned economy from 1949 to 1979,China implemented the“Welfare-oriented Housing System”in urban areas.Housing under such a system was characterized by its low rent charge and relatively poor but standardized living conditions.After 1. Introduction during the period of planned economy from 1949 to 1979, China implemented the “Welfare-oriented Housing System ” in urban areas. Housing under such a system was characterized by its low rent charge and relatively poor but standardized living conditions. After