Existing studies mainly discussed e grassroots governance innovation with the government as the main body but paid little attention to social-organization-driven innovation. There is no systematic comparison between the two innovations. Based on theoretical analysis, this paper refines four types of social-organization- driven innovation, including Research- Assist, Research- Cooperation, Copy- Assist and Copy- Cooperation, and shows the innovation process through four cases. Compared with government- driven innovation, the generation mechanism of social-organization-driven innovation includes survival competition, relationship network, value norm and power compulsion, which has comparative advantages such as weak risk constraint, high flexibility and strong sustainability. However, the organizational advantages of social organization have not been effectively transformed into the advantages of innovation. Those organizations are faced with limitations such as uncertain qualifications and a complicated participation process. Compared with institutional innovation and mechanism innovation, content innovation requires lower difficulty and complexity, which makes it the shared focus of both social-organization-driven and government-driven innovation. In the future, it is necessary to further enhance the autonomy of social organizations to participate in grassroots governance.