With the help of the famous search engine Google， AJAX（Asynchronous JavaScript and XML） is becoming more and more popular. On the other hand， a comparison with the traditional web application shows that AJAX has improved users' experience in web application through the asynchronous communication mechanism. Following the promulgation of a series of IEC 61970 standards， there seems to have loomed broad prospects for XML-based vector graphics scalable vector graphics（SVG） in web application of the power system. How to apply SVG to Power Graphics System in the framework of .Net is emphatically discussed therein in terms of the above characteristics. The principles of the non-fresh dynamic display of graphic data and electrically related information are elaborated. In addition， this paper also puts forward a jointly designed multi-user scheme to improve the efficiency of the graphics system.