In view of the fact that the traditional PI regulator has such flaws as poor robustness, weak anti-interference ability and liability to be affected by other factors, uncertainty and load disturbance in permanent magnet synchronous motor, combined with the analysis of mathematical model of PMSM and sliding mode variable structure control theory, an integral sliding mode controller has thus been designed based on PMSM vector control system. The analysis shows that the introduction of the integration of the state quantity into the conventional sliding mode surface will help to enhance the anti-disturbance ability of the system. The simulation results show that the proposed method exhibits better anti-disturbance performance, which improves the robustness of the speed control system, as well as the dynamic performance of the system.