Based on 1549 mm strip plant of taiyuan iron four slab reheating furnace with the characteristics of the pulse combustion technology, designed a digital combustion control system based on fuzzy PID control theory. By controlling the switching time of each burner, achieve control of the fuel and air feed rate to control the purpose of the furnace temperature. The fuzzy logic controller based on PID controller, the control action by conventional PID is implemented. Fuzzy control program block, according to the variation of input variables on system observation, expert experience and operation method, on the basis of fuzzy reasoning to make a decision, after setting the PID parameter online Kp and Ki. After the control system was put into operation, has a good dynamic performance, control temperature fluctuation is small, the advantages of saving fuel, has obtained the good use effect.