In view of nolinear, strong inertia and heavy delay questions of industry fuzzy temperature control system, a step-shaped temperature control system based on PID was designed. Based on analysis of conventional PID control technology, we make the improvement to it and carry on basic PID and the step-shaped position type PID control experiments with the fuzzy to confirm the systems control performance. The result indicated that compares with the conventional PID control, the control algorithm of position PID can realize the multichannel and the step-shaped temperature control, has the little over modulation, the high precision and good stability and so on merits.