Abstract: Purchase of services from social organizations is a systematic project, requiring not only strict programmed management but also refined organizational management. The Beijing municipal government purchases the services from social organizations in a way of grouping that means by focusing on the service purchase areas, the social organizations integrate their resources to form an untied strength to jointly undertake the service purchased by the government. As a form of social network,the grouping model reflects the organizational management innovation in the Beijing Municipal Government's purchase of services from social organizations. As the carrier of the organizational management for social organization, the grouping has become a materialized network platform, on which governments, social organizations including the supporting social organizations, enterprises and citizens play their respective roles. As an effective tool taken by the Beijing Municipal Government to foster and support the social organizations, the way of grouping refines the management of purchase of services, enhances the capability of self-government of the social organizations, and with great social value from which we could search out the construction mechanism for governing multi-main-body structure.