Abstract: Networking is a trend of control system development. This article introduces three primary phases of control system networking. It predicts emergence of open embedded devices networking control system based on TCP/IP protocol. Integration of different control networks is one of main features for current control system networking. There are several approaches to network integration of control systems in this paper. To view the development of control systems from the point of networking will do more good to the fusion of control, computer networks and communication technologies. It also provides a new idea for implementation of control and management integration information systems.