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Since the classical feedback design scheme of electrical motor control system is established on simplified system model, the varied parameter of the model would bring the change of performance of the whole system. This title proposed a new design method of controller parameters for the practical application of PMSM (permanent magnet synchronous motor, PMSM) to ensure the strong robustness of the control system based on theoretical derivation of system sensitivity. The new method took system sensitivity which measures the robustness of system as evaluation index, and combined PDF controller structure applied to second ordered control object to weaken the effect of the performance of the control system brought by varied parameter values of model. Established accurate simulation system model as an application case of speed control of this method, Simulation verify the minor changes in maximum overshoot of the observer(less than 4 percent) when rotary inertia and stator resistance varies under the this control scheme, and validate the ability of anti-parametric variation and high robustness characteristics of PMSM speed control system with the method proposed by comparative analysis with the conventional PID control.