Described are a method and a system for implementing function extension of an open platform. In the system, services that can be provided by an open platform are encapsulated and an operation interface is provided, so that plug-ins uniformly inherit the operation interface and transmit control parameters through the interface into a service entry to obtain the services. Therefore, the open platform has a simple framework and low coupling degree. Since the plug-ins are uniformly managed by a plug-in manager, the manageability and dynamic extensibility of the open platform are enhanced.