Permanent magnet synchronous motor （PMSM） is widely used in the industrial field. PI controller of PMSM cannot deal with the contradiction between fastness and stability, and the antidisturbance ability is weak. In order to solve these problems, the active disturbance rejection controller (ADRC) is used instead of PI controller in the speed loop of PMSM vector control system. Simulink is used to simulate the vector control system of PMSM based on ADRC and PI control respectively, and the control performances of the two strategies are compared. Then, the dSPACE experimental platform is used to verify the simulation results. The results show that the ADRC effectively suppresses the disturbance, the speed is adjusted quickly without overshoot, and the control performance of the system is improved.