Based on Ansys, MATLAB/Simulink simulation software, the working characteristics of a permanent magnet synchronous torque motor on formulti-physical field were analyzed. The motor electromagnetic simulation and modal to suppress the torque ripple and vibration; Simulate the centrifugal stress and rotor structure deformation of rotor in highest no load speed was analyzed. Check the technical index requirements of the reliability of the highest speed running point; United design the torque characteristics of motor control system based on Ansys Simplorer platform. Analyze the influences of the processing technology in motor performance, and sought the optimal design scheme of motor from the aspects of overall system.