In view of the biomass gasification processes a nonlinear, non-minimum phase characteristics, instability, dynamic process of the characteristics of the large delay and load disturbance, contains a large number of uncertainty factors, accurate mathematical model is hard to express, using a single control algorithm design of general control system is difficult to achieve the desired effect, and puts forward the Fuzzy - PID Fuzzy control technology combined with conventional PID control algorithm, achieve better control of temperature in gasifier furnace.