This paper proposed an improved proportional resonant(PR) controller, which was applied to the permanent magnet synchronous motor control system.Compared with the traditional PI controller, it can not only make the whole control system save a tedious coordinates transformation, but also remove cross-decoupling compensation and feed forward compensation influenced by temperature and electrical parameters, thus simplifying the control strategy.Simulation and experiment results show that the introduction of the improved PR controller to permanent magnet synchronous motor control system can achieve zero static error with the AC input signal, ant the system has a strong inhibitory ability in low-order harmonic and designated harmonic.