In order to make a better combination of the power supply model concept and the actual planning work, this paper makes a research on automatic routing of distribution network based on triangle power supply model with triple contact. Firstly in view of the constitution of power supply model with triple segmentation triple contact, according to the sequence of “single radiation- single contact- triple segmentation triple contact”, a planning model of automatic routing is established. Next the power supply model is optimized from the global perspective by using the genetic algorithm. Finally through the sample verification, the global optimum routing results are obtained, and the planning scheme conforms with the actual characteristic of the distribution network planning. Thus the feasibility and practicality of the above mentioned algorithm are proved. It is also helpful to direct the distribution network planning based on the power supply model to some extent.