As proved, new energy vehicles rely on the compact structure, light weight, high power density and high reliability of motor. Therefore, a new cooling system based on heat pipeair cooling system was designed. Firstly, a motor structure based on heat pipeair cooling system was designed. Then a motor’s finite element model (FEM) of thermal analysis was established and validated feasibly. The temperature field of this new kind of motor was investigated through FEM simulations under the rated power and the peak power. The results showed that the heat pipeair cooling system could effectively control the motor’s temperature rise. Compared with the water cooling system, the heat pipeair cooling system was simple and compact because of no water pump, tank, thermostat and other necessities. Hence, the heat pipeair cooling system fits itself more acceptable to realize the light weight and high power density in new energy vehicles.