Abstract: The relay protection setting range of Qianxi County Power Supply Company is expanded from 10 kV to 35 kV and below electrical equipment. The relay protection team shall fully master the relay protection setting method. Make the relay protection setting calculation template according to the actual situation of the company, and improve the setting calculation process. The program of relay protection setting calculation and setting value circulation is successfully completed, and the closed-loop management of relay protection setting calculation is realized.