Based on an analysis of the features of Web Service in the energy management system（EMS）， a new method for Web monitoring based on scalable vector graphics（SVG） and Web Service technique is proposed. This method uses SVG as the format to publish and display the graphs of EMS at Web， and publishes Web Services by encapsulating the operations of graphs and data to realize the dynamic refreshing of SVG graphs at Web. The generation and usage of the SVG format of electric graphics and the design and deployment of Web Service based on SVG graphics and WS-Security protocol are explained. This paper discusses the advantage of the method in currency， security and efficiency over the conventional techniques of EMS Web. The method proposed has been applied successfully in an actual EMS.