Abstract: Under the "dual carbon" goals, this study proposes a biomass Allam cycle power generation technology to address the issues of traditional thermal power generation. It couples biomass gasification with a supercritical CO₂ cycle and builds a full-process model through Ebsilon simulation. The results show that when 12.5 kg/s of biomass gasification is combusted with 14.711 kg/s of oxygen at 1572.87 ℃ and 10 bar, the turbine power is －59160 kW, the CO₂ capture rate is 90% (20.02 kg/s), the net efficiency is 34.53%, the net work is －38078 kW. Among them, for every 40 ℃ increase in the turbine inlet temperature, the net work increases by 3.52% and the net efficiency increases by 1.21%; when the turbine inlet pressure increases from 9.2 bar to 10 bar, the power increases by 2.7% and the efficiency increases by 0.91%; for every 0.4 bar increase in the turbine outlet pressure, the efficiency decreases by 5.88%. The system exergy efficiency is 40.08%, and the combustion chamber and cooler contribute more than 70% of the exergy loss.