Abstract: The power grid dispatching control system uses CIM/G language as the system graphics storage and exchange standard. At present, the Web graphic display process in the system is complex, the refresh is not timely, and the page response efficiency is low. This paper presents a Web graphic display technology of power grid dispatching control system based on CIM/G. This technology can analyze and display the CIM/G file through the browser, ensuring the consistency of the graphics displayed in Zone I and Zone III. The link mechanism between the front end and the back end of the Web is used to realize the real-time data transmission between the front end and the back end, which greatly improves the picture refresh speed. This technology has been applied in the III area Web of some power grid dispatching control systems. Real time monitoring of power grid and equipment operation status in Zone III through Web browser is realized.