Abstract: This paper mainly introduces the monitor application designment and implementation of wonderware system in Yunnan Provincial Grid.It also discusses the system's structure and functions.In this paper,we adopt Industrial Application Server(IAS),InTouch HMI,Historian and Historian Client as developing tools to achieve the running status,real-time monitoring and technical supervision.It helps us to intergrate all the grid equipment data to one platform,which is benificial to communication,storage,calculation,precaution and maintenance.As a consequence,the system can ensure stable power supply,prevent grid's damage,disintegration and large-area's power-cut.All these make a timely and accurate system for management and decision.