Innovation of social governance mechanism is an important part to promote state governance system and its modernization. The main tasks of social system reforms include basic public services system，new-typed community management system，modern social institutional system，public security management system and social faith system. The key is to break social relationship and activate the power of social development. From Sichuan’s practices，we have gone through livelihood-centered social management innovation，innovation with public services as main topics，social governance innovation with social institutional development as main topics. However，there are still the following problems：difficulties in legislation in social governance，social governance practices now mostly are characterized by local innovation，fragmentation and being not systematic. Social governance mainly focuses on the following：first，deepening government’s function to purchase social services from organizations；second，advocating social systematic thinking，integrating the existing institutional and organizational resources；third，fine development of social governance. The fourth，promoting legal construction of social governance.