Abstract: In order to rapidly assess of the reliability of distribution network, the switch components on main feeder system can be classified based on deep understanding of classical analytical method, in which section switches or breakers are regarded as feeder element formed by borders cutting, and the reliability of power distribution network is analyzed by taking feeder element as a unit and by considering the load transferring problem. Through assessment results, related feeder elements are added into distributed generation system according to the load ranking and maximization of the economic benefits, which strengthen power supply reliability for important users in power distribution system, and reduce economic loss brought by continuing power off among network loads. Taking RBTS-BUS 6 system as analysis case, the simulation results verify the effectiveness of the proposed methods.