This paper proposed six actives and key technologies of active distribution network, which are active planning, active management, active control and active service from the distribution grid side, active response from the customer side and  active participation from the distributed generation side. On the side of grid companies, the active planning of distributed renewable energy, the organic coordination of planning and operation, the active management and control of distributed generation, the active service for superior power grid and users are emphasized. Under the conditions of ensuring the safe and stable operation of power grid, the active planning, management and control can increase the hosting capacity for the distributed renewable energy power generation. The active service can provide new opportunities for innovation of distribution network business model and expanding business areas. On the side of users, the responsibility of energy conservation and emissions reduction is emphasized. On the side of renewable generation, the effect of distribution generation sets on the network is emphasized, and the technologies of active power control and reactive power voltage regulation should be deployed to participate in the power grid dispatching operation. Finally, the technology of active distribution network is discussed based on the above analysis, including integrated planning technology, operation and control technology, technology of response of demand and technology of power control of renewable energy.