Hydrogen production via biomass steam gasification and partial oxidation is analyzed from exergy aspect. Based on cypress sawdust gasified from 800°C to 1200°C, the exergy value of H2 from steam gasification rises from 1410.80 kJ kg-1 to 7922.89 kJ kg-1, while that from partial oxidation increases from 988.30 kJ kg-1 to 3097.81 kJ kg-1. The exergy efficiency of H2 from biomass also increases for both steam gasification (6.42–36.08%) and partial oxidation (4.50–14.11%). However, the exergy efficiencies of H2 from syngas are not in accordance. For steam gasification, the exergy efficiency rises sharply from 14.67% to 47.39%, and then increases slightly to 48.90%. For partial oxidation, the efficiency increases from 15.50% to 29.91% first, and then decreases slightly to 28.26%.