Community participatory governance is a proposition of our times，and promoting participation through shared behavior is a path to enhance community governance. Sharing can be both an end and a means. The rapid development of the sharing economy has provided operational possibilities for promoting community participatory governance. Among the community sharing platforms，the most typical ones are applets，WeChat groups and Moments based on WeChat platforms. The public and convenient features of community sharing platforms have a significant positive effect on promoting community participation. The Neighborhood Mutual Assistance Community Cloud Governance Platform in Baotaqiao Street，Gulou District，Nanjing provides a vivid and intuitive practical case for promoting community participation through sharing platforms.