Abstract: Hydrogen is gaining increasing attention as a kind of energy in the possible future. Biomass is an attractive feedstock for hydrogen production because its use would contribute little or no net carbon dioxide to atmosphere when biomass is grown sustainably. The technology of hydrogen production by catalytic gasification of wet biomass in supercritical water has been identified in bench scale. The previous work on theories and technologies of hydrogen production by biomass catalytic gasification on supercritical water is reviewed and the influence factors are analyzed. The development strategy for this technology application is presented.