Abstract: In order to study the enfulence factors of biomass fixed bed gasification for optimizing gasification process parameters, the kinetic simulation model of biomass gasification process was established by the Aspen Plus simulation system with its associated modules of RCSTR and Ryied reactors. The gasification process parameters, such as gasification temperature, air ratio(AR), water vapor intake(S/B) and biomass moisture content, and their effects on gasification process were analyzed through the kinetic simulation model. Then gasification process parameters were optimized by sensitivity analysis. Considering the above gasification process parameters, the simulation analysis of biomass gasification process was carried out, and the optimization parameters were gasification temperature 800℃, air ratio 0.25, and water vapor intake 2.3.