The raw material requirements for the indirect liquefaction of biomass are strict. The volume ratio of H2 to CO must be greater than or equal to 1.0~2.0. The effect on biomass gasification syngas in staged-gasification of biomass was analyzed. Biomass staged-gasification system contained low temperature biomass pyrolysis furnace and high temperature entrained-flow bed. Influence factors were studied including gasification temperature and first gasification time. The result investigation contained composition of syngas, volume ratio of H2 to CO, carbon conversion ratio, gasification efficiency and tar mass concentration. Results show that staged-gasification and increasing temperature can enhance the volume ratio of H2 to CO. The optimum condition of staged gasification was the first gasification time at 0.6 s and gasification temperature at 1 100 ℃. The result was best in the conditions. Gasification efficiency was up to 75%, the volume ratio of H2 to CO reached the maximum at 1.22, and carbon conversion was up to 96.3%. The tar mass concentration was decreased from 5.46 g/m3 to 50 mg/m3.
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