Abstract: IGBT is the core components of traction converter. The life cycle cost of a traction converter depends on the life loss of the IGBT module. To obtain the optimal life loss of IGBT, a locomotive traction force distribution control strategy was proposed and the output traction performance kepteped unchanged. Based on system structure principle and relevant actual data, this method firstly established a quantitative model of IGBT life loss by using the interval traction effort speed. Then, according to the planned interval speed and traction force curve of the locomotive automatic driving system, the real-time IGBT life loss was calculated under different traction distribution strategies, and the traction power distribution scheme with the best life loss was proposed. Finally, the actual running data of HX_D1 automatic driving locomotive was used to verify the effectiveness of the proposed method, and t. The results show that the proposed method can reduce the IGBT life loss obviously.