In order to solve the problem that the inherent parameters of the permanent magnet synchronous motor (PMSM) were changed due to external interference, a new intelligent control technology was introduced into the control system of PMSM, and a new control strategy based on the integral backstepping adaptive method was proposed. The controller could dynamically suppress and eliminate the influence of parameter changes on the system by using the cross axis current. Based on the Lyapunov stability principle, the control laws and the adaptive laws of the controlled system were designed, and the integral action was introduced to improve the stability and shorten the time of the speed response. The simulation experiments showed that the controller had strong robustness as well as good dynamic and static performance to suppress the influence of the change of the inherent parameters.