Abstract: The suburbanization of Chinese big city is a “demand impacting” process, is also a rapid social change process,having advantage and disadvantage at the same time. As a governance action in the process, social management is in responsible for urban and rural “double dualistic structure ” task, facing the prudent transplantation of management idea and model from city center to the outskirts. The exploration in reform of social management system, the management of floating population, the new community construction and public service in Beijing Chaoyang District is positive,but there exist problems of reduction flow population control, public service not balanced, social management mode suitable transplantation. Social management needs to respond to “spread ” and “ endogenous” social demand, to avoid new formation of “ double dualistic structure”, also needs to combine the village self-government tradition and modern city community autonomous.