By analyzing the major problems of distribution management system（DMS）， a design principle of the new generation distribution automation and management system is presented in accordance with the international standard and the developing trend of the computer technology. Taking realization in Nanjing Power Supply Company based on the principle as an example， the paper presents the key technology in the new DMS. The seamless integration with common geographic information system（GIS） can assure a same model and graph being used in the real-time and management application. Multi-context and synchronization function of model and graph can monitor the life cycle of facilities. Combining the custom-tailored flow control， the real-time data， model and topology information can be shared by distribution network dispatching work management and the paper-free operation of the dispatching network dispatching flow can be realized. The topology analysis embedded in every operation can strengthen the safety of power system. Some ideas about the future GIS development are also put forward.