According to the mathematical model of the permanent magnet synchronous motor based on the αβcoordinate system, the traditional direct torque control system simulation model was built by using the Simulink stool in MATLAB. According to characteristics of the system of magnetic flux and torque output fluctuations, supertwisting synovial variable structure control strategy based on, in the dqcoordinate system design flux and torque controller, then built the simulation model, in the new model, hysteresis comparator was replaced by torque controller and flux linkage controller, it was concluded that the improved system of electromagnetic torque and motor speed of response curve. By comparing the curve of the traditional direct torque control system, the results showed that the electromagnetic torque curve of the improved system was significantly reduced, and the speed response was obviously accelerated.