Abstract: In order to solve the power quality problem caused by the Kuge Railway to the power grid in Ruoqiang area of Bazhou, Xinjiang, and eliminate the harm caused by harmonics and three-phase voltage imbalance to the grid, according to three-phase voltage imbalance investigation report of State Grid Bazhou Power Supply Company for the Ruoqiang power grid, PSASP software is used to simulate and calculate the three-phase voltage imbalance and voltage surging caused by electric locomotives passing through the Ruoqiang area. Based on this, a separate grid operation method is adopted to increase the number of electric railways and the electrical distance of the conventional user load, reduce the impact of the electric railway load on the conventional users. Using the Fluke 1760 three-phase power quality recorder, the harmonics and three-phase voltage unbalance of each site are tested on site and power quality evaluation is performed, and the treatment measures for the three-phase voltage unbalance of the Ruoqiang area power grid are put forward, which effectively solve the power quality problem after the Geku railway is connected to the Bazhou power grid.