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The big inertia, time-varying delay, hysteresis characteristics of the heating process seriously affect the control performance. In order to solve the above problems design the flow adjustment based on temperature for the secondary network. And respectively for hysteresis characteristic join the Smith algorithm on the basis of the PID algorithm, and in view of time-varying delay characteristic join fuzzy control on the basis of Smith and PID control. Separately on the model we set up and the changed model due to external factors such as the disturbance designs a Smith-Fuzzy-PID controller and simulates the control effects. The simulation results show that Smith-Fuzzy-PID algorithm on the original model and changed model can achieve good control effect. And the method is feasible and effective.