Abstract: The frequency of voltage drop, power grid harmonics, and voltage instability and so on in AC power distribution network is gradually increasing. The domestic and foreign research scholars now turn to the new field of DC power distribution network. Compared with AC power distribution network, DC power distribution network has the advantages of low cost, low transmission loss, high power supply capacity, high reliability, environmental protection, high power quality, easier for distributed power and energy storage to access and other characteristics. In this paper, the topology, advantages and characteristics, key technology of DC distribution network are described, and the development of intelligent DC power distribution network in China is summarized and prospected.