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Aiming at the problems of non-linearity, hysteresis, and coupling of polymerization reactor temperature, and based on the research and analysis of polymer reaction process flow, control requirements, and control object characteristics, a fuzzy PID control and cold and hot water were used. Multi-valve opening control of variable ratio dual-mode segmented temperature compound control method, through the PCS7 process control system to provide a structured language SCL programming controller module, continuous function control chart CFC temperature control system to build the control loop, SFC set up the sequence diagram The control process was set up, and the control program was implemented in combination with the advanced multi-function process and control simulation device (SMPT-1000), and compared with the traditional PID temperature control effect. The experimental test results show that the composite control scheme has lower overshoot than the traditional PID control. It has superior steady state performance, faster response speed and higher energy utilization efficiency, and improves the reactor temperature control performance.