A dynamic terminal sliding mode control system designed as to the problem that permanent magnet synchronous motor (PMSM) is vulnerable to external interference in the process of operation. Nonlinear function is introduced into the terminal sliding mode control in the design of sliding hyper-plane, thus making the tracking error in sliding surface in the limited time converge to zero. Dynamic sliding mode control method can be used to eliminate the chattering phenomena caused by the discontinuity of controller switch function. Based on this, using good approximation of fuzzy system to estimate the uncertainties and external disturbances of PMSM a fuzzy technique dynamic Terminal Sliding Mode Control method is proposed. The use of the method can effectively reduce the chattering phenomena caused by upper bounds of uncertainties. Simulation result demonstrates that the system is good in tracking performance, non-sensitive to the parameter changes and of strong robustness.