Based on the Maxwell 2D and Simplorer cosimulation platform, a permanent magnet synchronous motor (PMSM) for electric vehicle traction with a rated power of 20 kW was used to study the simulation model of the motor traction system which could consider the motor saturation problem and the loss, analyzing and comparing the constant torque interval id=0 control and MTPA control, high speed interval id=0 controled and weaked the magnetic control traction characteristicsspecific comparative analysid of the motor flux, current, torque ripple, drive efficiency and other characteristics. And the correctness of the simulation method was validated through experimental tests, and provided reference for the control simulation of electric traction motor speed control system.