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For complex high order object is put forward based on the Numerical optimal model reduction method, and based on the model reduction method to design the predictive PID controller, the controller was applied to the original model can get a good control effect. the Numerical optimal model reduction method makes complex high order objects can approximate for a first order plus time delay or second order time delay object, through the model of step response and Bode chart compares, the reduced order model curve approximation of the original curve model. Predictive PID has a good control effect of large time delay systems; the model reduction method makes prediction PID control complex high order systems, and its simple structure, less tunable characteristics.