Abstract: Targeting the frequent fault of traction converter power module of a domestic type high-speed EMU, causes of the fault are analyzed, and specific solutions are put forward. Analysis reveals that both the too short non-overlapping time and the sudden initiation IGBT (insulate-gate bipolar transistor) gate can cause the short-circuit of the main power circuit, leading to power module fault. Relevant experimental results show that changing non-overlapping time of power module control logic can achieve the goal of optimizing gate initiation sequence, effectively solving the problem of power module frequent fault. By controlling component quality, replacing failure component, the IGBT gate sudden initiation problem can be effectively solved.