Abstract: According to the heat dissipation requirements of high-power converter power module, a theoretical calculation method of power module loss suitable for engineering application is introduced. The calculation results are compared with the double pulse test results, and the accuracy meets the design requirements. After the loss of power module is obtained, a set of forced air cooling heat dissipation system is designed. The radiator adopts the structural form of two side baseplates and middle teeth. The cooling fan is calculated and selected according to the operating conditions of power module. The heat dissipation system is simulated and analyzed by using Flotherm software. The simulation results show that the heat dissipation system meets the heat dissipation requirements of the power module.