Based on the analysis of the data of Population Census 1982, 1990 and 2000, this paper points out that the speed - up of the migration of the urban population to the Suburb and that of the rural population to the Urban is the main part of population distribution in Shanghai. However the population urbanization are relatively behind the development of economy and the non - agriculture industries. It is very important to realize that the immigration will play a very important role in the urbanization and population distribution which is a profound social reconstruction process.