Abstract: To solve the slagging and tar in biomass thermochemical utilization,the method of the crude syngas combustion after low-temperature gasification was proposed.Experiments of combustion after gasification to rice husk were taken by changing equivalence ratio of agent（aag） and the ratio of steam to air（S/A） on the self-designed experiment bench.Temperatures of the point which was 500 mm over the vibration grate in the gasifier and the flame front in furnace were measured by thermocouples respectively;the volume percentage of syngas was also measured under different conditions by an off-line gas chromatograph（SP-3420A） which was set at 1000 mm over the vibration grate.The results of the experiments show: The gasification temperature increases when increases and S/A declines,while the temperature of the flame front decreases with and S/A increases.The volume percentage of H2 reaches maximum value whenaag is 0.35 and S/A is 0.10.The volume percentage of CO increases as aag increases,while the increasing trend gradually decreases.The volume percentage of CH4 decreases when ER-ag increases and S/A decreases,respectively.The results of this paper provide basis and reference for the design and running of combustion after gasification system to biomass.