In order to find the most appropriate connection mode of 10 kV distribution network, a new approach is put forward ,in which the comprehensive weight method is applied to power system planning. At first, the main kinds of connection mode of 10 kV distribution network are introduced,then,basing on the information of subjective weights and objective weights, the performing process of the new approach is presented. It can choose the most appropriate connection mode of 10 kV distribution network sufficiently and can be calculated easily. At last, the validity and practicability of this new approach is testified with a sample.