Beginning with an analysis of the present security hazard of TCP/IP protocols, this paper mainly discussed the modification and improvement of TCP/IP protocols, and then advanced the structure model of Internet security system based on TCP/IP security frame.

This paper advances a new TCP/IP system architecture with QKD and IPSec,and discusses how to create and implement virtual private network with the new system architecture.

The TCP/IP protocol in network programming was introduces, the Winsock architecture was also discussed, then the developing process of communication based on Client/Server model under the environment of Visual C++ was described.

For improving the management level of laboratory,this article introduced a way of designing and implementing the remote power-supervision system based on embedded system,and according to the system s characters,TCP/IP protocol was simplified,the teaching requirement was met,and at the same time the system s compatibility is ensured.

TCP/ IPand UDP(User Dategram Protocol)are adopted in Ethernet-based communication and the imple-mentation of UDP at communication control layer and substation layer is detailed.

By combining multim edia technology and TCP/ IP based network technology with the substation autom ation,a new idea of substation multim edia automation system is proposed to realize digitized transm ission of m ultimedia information between master station and substation.