Abstract: Hybrid rotor permanent magnet motors(PM motors) are characterized by high power density, but it also leads to the problem of insufficient cooling space and cooling capacity. For this purpose, a dual-duct cooling system is proposed based on its unique rotor structure, and the temperature field of the motor is simulated using the computational fluid dynamics(CFD) method. Firstly, an axial fan, tailored to the dual-airway configuration, is designed in accordance with motor loss and size considerations. Subsequently, various structural parameters for different air inlets and outlets are subjected to simulation, and the simulation results are compared and analyzed. The optimal combination of parameters, offering superior cooling performance, is identified. Finally, simulations are then conducted for both the single duct and the dual duct, employing this selected parameter combination. The simulation results unequivocally demonstrate a significant enhancement in the motor's cooling capacity through the utilization of the dual duct cooling structure.