Temperature for industrial control is a very important parameter, the accuracy of the temperature will directly affect the quality of industrial products. However, the temperature system has the problems of large inertia and lag, and it is difficult to establish accurate mathematical model. In this paper, the diffusion pump to the heating process of oil heating as the optimization objectives. In this paper has introduced the fuzzy PID controller and particle swarm optimization(PSO) PID parameters algorithm principle and operation mode, and use the Simulink simulation function of MATLAB in the three methods are simulated, and the simulation waveforms are analyzed. The above two controllers are switched in the process of temperature control, and the superiority of this method is verified by simulation.