Abstract: When the charger based on the high-frequency switching charging technology is used to charge the pulse power supply, due to the existence of distributed inductance in the charging circuit, during the high-frequency current charging process, overvoltage higher than the charging voltage will be generated at both ends of the T-type protection circuit of the charger, and there is a risk of damaging the semiconductor power devices of the T-type protection circuit. To solve this problem, the simulation model of charger and pulse power supply circuit is established, and the preliminary law of the influence of the distribution inductance change of charging circuit on T-type protection circuit is obtained through simulation analysis, and it is further verified through experiments. To reduce the influence a solution to reduce the distributed inductance of the charging circuit is proposed. The main method is to change the type and length of the output cable. The effectiveness of the solution is verified by simulation and experiment, which provides a reliable reference for the engineering application of the pulse power supply.