In the current permanent magnet synchronous motor (PMSM) double closed loop vector control system which adopts the maximum torque current ratio control strategy, due to the external load of the motor or the sudden change of the motor torque, the current regulator is saturated with integral points, which leads to the problem that the actual stator ac-dc current of the motor cannot track the given MTPA current quickly. A two-vector model predictive control strategy based on model predictive control principle is proposed to replace the current loop regulator in traditional double closed loop motor control system. Based on the analysis of the control principle of permanent magnet synchronous motor MTPA and the causes for the saturation of current inner ring regulator, by use of the nonlinear constraint handling capacity of model predictive control, more accurate voltage vector can be obtained in each sampling cycle through two voltage vector model predictive control strategy, so as to realize the real-time dynamic tracking of the target of permanent magnet synchronous motor MTPA trajectory. The simulation and experimental results show that this control strategy can track the change of the given MTPA current in real time when the motor torque is given or the external load torque suddenly changes, and the current of motor stator shows no major fluctuation.