Abstract:Distribution network which connects transmission system and electric auxiliary system is an important part, so the rationality of the distribution network directly affects the efficient operation of the entire power grid. This paper is based on the minimum spanning tree algorithm to achieve the reasonably optimal planning of distribution network. First, it introduces the distribution network structure optimization mathematical mode and a power flow calculation of distribution network. Then it illustrates the basic theory of the minimum spanning tree algorithm and uses the minimum spanning tree algorithm to make a research on the structure optimization of distribution network. Finally, using two examples to verify the method of this study, the results show that the minimum spanning tree algorithm in this paper is feasible and effective to realize the structure optimization of distribution network.