With the informationization process of electric power industry, in recent years, a variety of information, monitoring systems and distributed control systems for marketing management have gone into service and these various types of systems have accumulated a large amount of user information. Therefore, in order to solve the questions as how to develop the decision support systems which is based on the Electric Power Marketing Management Information System, and how to help enterprise's leaders to make scientific marketing decisions to meet the demand of competition, it is useful to realize the decision support system based on EDW (Enterprise Data Warehouse) Structure and data warehouse technology, which is approved in application. Basic rules of database's structure will not be discussed detailedly in this paper. In contrast, we will talk over the solutions and application prospects of EDW-based electric power decision support system with the system design and implementation in Chongqing Electric Power. (4 pages)