In view of the flaws of large amount of on-line calculation and difficulty in the determination of the optimal weight coefficient in the traditional model predictive torque control, an improved model predictive torque control method has thus been proposed for the permanent magnet synchronous motor. Based on an establishment of a surface-mounted permanent magnet synchronous motor model in the d-q rotating coordinate system, the predicted parameters required for model prediction can be determined by the predicted torque control target, with the torque and flux standardized, and the torque error and flux error transformed into torque error rate and flux error rate, to be followed by the addition of the flux constraint equation to obtain the cost function of weightless coefficient. Meanwhile, a simplified current prediction calculation method is adopted to reduce the amount of core calculation in the forecasting process. Simulation results show that the proposed method can significantly reduce the amount of system online calculation while ensuring the control performance, and markedly reduce the harmonic amplitude, thus improving the waveform quality and the voltage utilization as well.