In order to overcome the shortcomings of the stator flux and torque ripple existing in the conventional direct torque control(DTC) system of permanent magnet synchronous motor(PMSM), this paper put forward an improved method using the variable parameter PI speed controller and fuzzy controller respectively to replace PI speed regulator and hysteresis comparator of the conventional DTC. On the basis of this, the new schematic of control strategy for PMSM DTC was rebuilt. The conventional PMSM DTC and the improved DTC system were simulated comparatively. The experiment results show that the improved system has good dynamic and static performance, 1ess flux and torque ripple, and can meet the performance requirements of the control system' fast response.