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Bio gas is a kind of clean energy, which is often produced by biomass gasification. At the present work, the effects of multi-factors on the volume fraction of gas were analyzed numerically based on big data, and these factors included temperature, pressure, biomass species and various gasify agents. Moreover, the volume fractions and mass fluxes of gas was discussed. Pressure and temperature were set at the ranges from 1MPa to 6MPa and from 400unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘C to 1000unmapped: inline-formula unmapped: math unmapped: msup unmapped: mrow unmapped: mrow unmapped: mo ∘C, and the gasify agents selected H2O, H2O-O2, O2, CO2 and H2. The results show that the highest yields of gas were the pine sawdust with the highest content of C, H and H2O since the yield of gas depend on the component contents of biomass. Pressure has a reverse effect on the variations of gas volume fractions compared to temperature. As pressure rose, the volume fractions of both H2 and CO reduced, while the volume fractions of both CH4 and CO2 ascended. On the contrary, the volume fractions of both H2 and CO increased, while the volume fractions of both CH4 and CO2 decreased with the increasing of temperature.
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