Abstract: The oxygen gasification of pine sawdust for the production of bio-gas was conducted in a high-temperature fixed bed reactor. The impacts of gasification temperature and equivalence ratio(ER) on oxygen gasification prepared bio-gas heat value, bio-gas yield, and the volumetric fraction of each component in bio-gas were evaluated. The obtained optimal process parameters were debugged and validated in the demonstration project of biomass gasification to generate bio-gas for industrial boilers. The results showed that the gasification temperature of 850-950 ℃, the heat value of the gas raised initially then fell with the ER increase, reaching its maximum value when the ER was 0.24. Moreover, the gasification temperature exhibited a significant effect on oxygen gasification of sawdust. With the rise of gasification temperature, the gas heat value and the volumetric fraction of H₂, CO, CH₄ in gas increased, and the gas production rate increased initially, then decreased and reached its highest value at 900 ℃. Under the optimized conditions of gasification temperature of 900 ℃ and the ER of 0.24, the heat value of prepared gas was 13.14 MJ/m³, the gas yield was 0.98 L/g, and the volumetric fractions of H₂, CO, CH₄ and C₂H_m in the gas were 17.64%, 39.78%, 12.45% and 2.76%, respectively. These parameters were implemented in the demonstration engineering, resulting in a calorific value of 10.90 MJ/m³ and a gas production rate of 1.02 L/g.