Abstract:In view of the object with the large time-delay and large inertia，which is difficult to be controlled，the method of P-PID Dual-Model control based on the conventional Smith Predictive Control is applied，which can increase control system’s early response speed and decrease the excessive overshoot.Furthermore，the method of Dual-model Smith Predictive Control with gain and phrase compensation function is presented.The simulation result shows that the algorithm can efficiently improve the effects of Smith Predictive Control when object model is unmatched，and increase the adaptability of the control system.