Abstract: Aiming at the problem exiting in reliability assessment of distribution automation,in which fault diagnosis and switch control is not comprehensive enough,a reliability rate assessment algorithm based on terminal configuration influence relationship is put forward in this paper.The feeder is split into base segment,and then,feeder segmentation relationship matrix and feeder base segment influence matrix are determined according to terminal configuration location.Then,the solution value is obtained.Three terminal configurations of overhead lines are simulated and calculated.Simulation result shows that the proposed method can effectively solve the reliability rate with different types and locations in complex network structure,which provides reference for the selection of distribution automation terminal configuration schemes.