IP Network camera (referred IPCam), due to the advantages of flexibility with relevant technique and involving a wide range, has been widely used in the industry network video surveillance. But the lack of a unified interface standard , different manufacturers products in IPCam can’t do interconnection process, not only makes allowing interoperability between the various manufacturers become a serious problem, but also remains a major issue to build a largescale network monitoring environment. This paper focuses on the ONVIF protocol, first introduced the service composition and operation mode of the ONVIF protocol in detail, and analyzed the communication process from IPCam services to client. After mastering the basic principles of Web Services in the network video surveillance applications, studied the core content of ONVIF protocol. What’s more, Set discovery, device management, event processing and realtime streaming media service that ONVIF specified are designed and implemented in the IPCam platform finally. All products supporting ONVIF client can access the camera, make it access to the IPCam internal implemented services, which address the interrelated issues of network video products.