On the basis of expounding the context of the rising of gated community in China and its characteristics,this article analyzes the social and cultural mechanism of the rising of gated community in China,and then discusses the social-spatial problems when gated community becomes dominant living mode in cities,such as the tendency of the private owning of urban public space,residential segregation and social exclusion. It puts forward that gated community is the necessary product of social transition in China,and that its inherent abuses severely affect social harmonious. Therefore,it points out that it is necessary for the government and planners to adopt planning measures to reduce side effects aroused by gated community.