This paper presents a power quality aided service system based on power supply enterprise's electricity information network, a integrated management platform which can manage power quality monitoring data; evaluate the effect of disturbance loads and design and check the parameters of filter and SVC systems is implemented. In the system, each sub function Web service is encapsulated as an agent abstractly; each user's function view and each aided service function can be combined dynamically by agents; the system use the contract net protocol based on Web service as the multi-agent cooperation way. These measures optimize the aided service performance and enhance the intelligence, sharing and expansibility of the platform. By accessing to the electricity information network Management departments at all levels inside power supply enterprise can use the system to accomplish the sharing of information and technical supervision interaction. It also realizes the standardization and normalization of power quality technical supervision.