Abstract: In recent years, along with renewable power integration, economic slowdown, the reformation of the electric power market and the high demand for the quality of electric energy, the people have higher and higher request for the power system reliability, especially for the distribution network, which is the last part of power system. The reliability of distribution network is not only important for consumer, but also critical for the national economic development. To improve the grid structure and reliability in the basics of present supply level is the mission and duty of power system. This paper put forward some suggestions and measures that improve the reliability of distribution network.