Abstract: The hydrogen side pipeline is prone to being blocked due to the low-temperature icing in the purging process of the existing on-board fuel cell pipeline,which tends to result in the difficulty of a cold start. In response to this problem,a two-stage purging scheme of the hydrogen pipeline is proposed,so as to realize an independent control of the content of residual water and steam in the hydrogen pipe of fuel cell stack,reduce the heating energy consumption during a cold start and avoid the failure of the cold start. Based on a threedimensional simulation,the temperatures of the middle section of the mid cathode at different times,the ice volume fractions of the section at different times and the temperatures on the surface of the longitudinal section of the battery at different times under four different working conditions are analyzed. Results show that this scheme can achieve a stable cold start in 20 seconds at-20 ℃,which offers the solution to the difficulty in low-temperature cold start,and meanwhile ensures the output performance of an electric pile after a cold start.