Steel cycle power generation process, the mixed Gas Heater Control Valve to the gas turbine has a normal working range, in order to realize the adjustment to the gas pressure in the pipeline, so that the cycle power system stability, this paper designs a set of butterfly Gas Water Heater Valve pressure regulating system. Mixed gas pipeline system is a drastic disturbance, strong nonlinearity and pressure regulating large time delay system, the conventional PID controller has the advantages of simple structure, its control parameters under a given condition tuning is complete, do not have the ability of online tuning parameters, it is difficult to achieve the ideal voltage stabilizing control requirements. The field of intelligent control of fuzzy control and conventional Gas Water Heater Valve combining fuzzy incremental PID control, can realize the adjustment of the PID parameters online, so quickly on the pressure fluctuation adjustment. According to the pressure in the process of steel circulation power regulating system of the work requirements, and designed the fuzzy PID controller, and the dynamic characteristic simulation in heater valve Simulink environment.