Abstract: This paper analyzes the status and existing problems of middle voltage distribution networks. Considering comprehensively several factors of the middle voltage grade distribution networks such as power supply capacity, energy loss on the line, reliability, economy and so on, the model of analytic hierarchy process of the middle voltage distribution networks is proposed in the paper. Finally, the results of simulating calculation of three representative power load density regions demonstrate the efficiency of the proposed model, and show that two kinds of voltage grade sequences of 220/110/20/0. 4 kV and 220/20/0. 4 kV are suitable for urban area of the three regions, while the voltage grade sequence of 220/110/20/0. 4 kV is suitable for the countryside of the three regions.