Aiming at the long － term high loss problem of hydropower transmission lines in Kaidu river basin of Bazhou and according to the planning of Bazhou power grid and the grid structure of Bazhou area，the hydropower delivery situation in Kaidu river basin is calculated and analyzed with power system analysis software package (PSASP) taking reducing line loss of hydropower transmission lines as the target，and loss reduction scheme for transmission line is proposed． The application results show that the proposed scheme effectively solves the problem of high loss of hydropower transmission lines in Kaidu river basin and reduces the line loss rate of main network of Bazhou power grid，which achieves the purpose of energy saving and loss reduction，and improves the economic benefits of the company．