For the current situation of permanent magnet synchronous motor’s wide speed range application and fluxweakening, a method of permanent magnet synchronous motor’s wide speed range control is proposed. This method is based on vector control theory, id=0 control method used below base speed and fluxweakening control method used above base speed. Direct axis current reference value id* is generated by external voltage loop controller. id* is not dependent on motor parameters and easy to digital realization. The current feedback decoupling control method is proposed to decouple completely d and q axis current, which improves the control performance of permanent magnet synchronous motor. The control method is simulated in 5.5 kW interior permanent magnet synchronous motor. The simulation results show the speed range expansion is up to three times, at the same time, speed and torque control performance is good. The simulation verifies the effectiveness of the control method, and the control method has practical significance for the wide speed range application of permanent magnet synchronous motor.