At present, public square dancing which is organized spontaneously in the housing estate as a unit is extremely extensive. But it lacks of mutual communication, and the online platforms which provide guidance and norms of public square dancing are absent. An online community for dissemination and promotion of public square dancing is developed. ASP.NET is used for the platform, HTML5 is used for interface layout of foreground, SQL SERVER is used for database design, and data mining technology is used to match user’s interests and hobbies. The platform facilitates the users to find the best resources and sellers to make strategic decisions.