Real-time communication technology has been widely used in mobile Internet. The real-time rich-media communication between users requires relatively reliable real-time communication mechanism in the unstable mobile Intrernet. This paper used ELGG as the social networking platform, and MQTT as the message transport protocol. On the bases of relationships between mobile radio users, we designed and implemented the architecture of real-time communication mechanism based on message notification. Finally, we validated the feasibility of this communication mechanism through information exchange over mobile terminals.