Abstract: In order to optimize the design and operation parameters of the reactor and the value-added utilization of biomass char, the gas composition and gas production parameters of rice husk gasification were analyzed on the basis of gasification test. The surface morphology, physical characteristics and carbon structure of biomass char were characterized and analyzed by various methods. The results of gas analysis show that the volume fraction of CO in gas is the highest, about 18%, the volume fraction of H₂ is about 7%, and the calorific value of gas is about 5.48 MJ/m³, which belongs to low calorific value gas. The analysis of the physical characteristics of rice husk char shows that the main elements of char are C, O, Si and K. The BET specific surface area of char is 21.7742 m²/g. A small part of the particle size is 1-10 μm and 100-300 μm, most of the particle size is 10-100 μm. Most of the pores of the char are mesopores with a pore size of 2-10 nm, and there are a small number of micropores and macropores. The average pore size is 7.0496 nm, and the total pore volume is 0.050907 cm³/g. X-ray diffraction analysis shows that the char contains quartz crystal SiO₂, the disorder of carbon is high, and the degree of graphitization is low. The infrared spectrum analysis shows that the macromolecular structure of the char contains functional groups such as —OH, C=C and C—O bonds. Raman spectrum analysis showed that the semi-coke contained graphite structure, the intensity ratio （I_D1/I_G） of D1 peak to G peak was 7.93, and the carbonaceous structure of char has a high content of defective carbon and amorphous carbon structure.