To satisfy various demands of information integration in the customer field management system， Web Services technology is adopted to integrate the real-time data and FTP（file transfer protocol） to transfer formatted files for non-real-time data integration. By the two integration methods the following functions have been realized: basic document information synchronization， automation of services such as meter reading and fee reminding， as well as comprehensive monitoring of important customers. Recently， the two methods have both been applied in the business integration of the customer field management system and the marketing management system in Chongqing Electric Power Company.