The four simulation models of induction motor direct torque control (DTC) system, model predictive torque control (MPTC) system, the DTC system based on duty cycle modulation and the MPTC system based on duty cycle modulation are established. The comparisons of different control strategies are carried. Simulation results show that in terms of control performances, the MPTC based on duty cycle modulation>the MPTC>the DTC based on duty cycle modulation>the DTC. The duty cycle modulation based on torque deadbeat control can not only optimize the duty cycle of voltage vector, but also decrease torque ripple and improve control performance.