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For the polypropylene multi-zone circulating reactor cascade control system with time delay as a complex higher-order system, the controlled object has a large lag time, and the process control of the system is difficult due to the influence of internal heat release, reactor inlet temperature, water flow in the jacket and other disturbances. The first-order plus pure lag approach to the higher-order system is adopted, and the model reference adaptive control method is applied to make the online setting of the sub-loop Smith-predictor of the adaptive mechanism, which makes the dynamic of the Smith-predictor close to the dynamic of the sub-control object. At the same time, a reference model is set in the main loop according to the expected performance index, and adaptive algorithm is applied again to make the output of the controlled object in the winner loop track the output of the reference model as much as possible. The simulation results are employed to illustrate the effectiveness of this approach.