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Quasi-sliding mode variable structure control strategy takes its own advantages in solving discrete-time and time-delay systems' problems. This paper proposed a kind of quasi-sliding mode control algorithm based on the Smith Predictor. The simulation results showed: the proposed control method greatly compensates time-delay and the control strategy could be simply and easily realized. On the premise of ensuring the stability of the second order closed-loop system, this algorithm helped systems gain good robustness against parameter perturbation and external disturbance.