Abstract: There are a lot of social strata and sub-groups among city inhabitants in China. They have different interest requirements, thus, social management in city has to face interest disputes among different groups, particularly the contradictions between officials and common people, between labor and management, between poor and rich. These interest contradictions are characterized by its complexity and increasing violence. Once an interest dispute arises, most urban inhabitants normally intend to express their interest demands and solve problems in legal ways. However, if these ways are ineffective, inhabitants involved will inevitably seek for expressing channels out of the system, and this may lead to group events. Urban government, social organization and inhabitants ought to jointly pay high attention to it.