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In order to improve the accuracy and objectivity of the traction motor evaluation system of hybrid electric vehicle and make sure of the optimality performance for the motor, 23 evaluating indicators were listed according to the motor body design, performance of motor control and the driving cycle of vehicle. The traction motor performance evaluate system was established with the grey relation degree approach to multiple attribute decision making as evaluation method, and the motor bench test and computer simulation platform as instrument. At last, taking traction motors of hybrid electric bus of FAW as an example, the evaluation system was demonstrated. The results proved that the performance of motor could be determined by the evaluation system.