Abstract: Traditional SCADA system can't satisfy with the needs of information interactive, and it is hard to realize information sharing. The design and implementation of cross-platform substation supervisory control information publishing system based on Web Service is introduced in this paper. Here, the structure and functions of substation distribution system and the way to implement them are presented. Web Service realizes communication between components with different technology and platform, affording technology support to solve information sharing through cross-platforms. The system integrates Internet services and completes distributed network services, and support same-time and history information access. This method is a new solution of integration of power enterprise MIS. Key words: substation; supervisory control system; web service; web publishing system