Abstract: In order to solve the problem that the temperature of the key electronic components in the gun driver is too high during the gun driver operation, a thermal analysis method based on finite element is proposed to analyze the temperature distribution of the components in the driver. The simulation model of the driver is established by using the thermal analysis software Icepak, and the improvement measures of the heat dissipation structure of the driver are put forward according to the simulation results. By using the parameter optimization tool of Icepak, the optimization design scheme of the heat sinks in the driver is obtained, which effectively reduces the temperature of the key electronic components in the driver and ensures the safe and reliable operation of the driver. The design method in this paper provides a reference for the thermal design of similar drivers.