Aiming at the new problem which faces in the rapid development of the urban distribution network planning,such as rapid increase of load density,shortage of land supply and ever-increasing land price,a new method of the group planning of distribution network is put forward．The method adopted improved K-means clustering algorithm as a tool,combined with the equivalent circular power supply range and substation spacing between substations,dividing the power supply area into several groups．Supplying power of area with a unit of group,connecting tightly with each other in the groups,sparing to each other between groups,can effectively control the short-circuit current,improve the flexibility of distribution network operation．The group planning method is applied in an actual distribution network,verify the feasibility of the group planning method．