This paper focus on a salient-pole of synchronous motor with the purpose to investigate the effects of the pole’s winding structure parameter of rotor the on the flow field and the temperature distribution inside the motor. A 1/8 of 3D physical model was established and the corresponding boundary condition was given. Based on the principles of Computational Fluid Dynamics，numerical simulation was proceeded using finite volume method. The change of the flow field and the temperature distribution inside the motor was analyzed for the height of the rotor pole’s winding from 80 mm to 90 mm and the thickness of the winding’s main insulation from 4. 5 mm to 2 mm. The result shows that the increase in height of pole coil increases the peak temperature and the average temperature and the coefficient of convective heat transfer of pole shoe surface decreases due to this increase in height. The thinner of Insulation decreases average and peak temperature of the pole but it has a little effect on the surface coefficient of convective heat transfer of the pole shoe. And it can provide theoretical support for the design and optimizing of motor structure.