Biomass pyrolysis gas (including H-2, CO, CH4, CO2, C2H4, C2H6 and etc.) reforming for hydrogen production over Ni/Fe/Ce/Al2O3 catalysts was presented in this study. This study investigated how the operating conditions, such as the calcinations temperature of catalysts, the reaction temperature, the gas hourly space velocity (GHSV) and the ratio of H2O/C, affect the conversion of CH4 and CO2 and the selectivity of hydrogen from dry and steam reforming of pyrolysis gas. The experimental results indicated that, under the conditions: the reaction temperature of 600 degrees C, the GHSV of 900 h(-1) and H2O/C of 0.92, the reaction efficiency is the optimal. Especially, the concentration of H-2, CO, CH4, CO2, and C2Hn (C2H4 and C2H6) were 36.80%, 10.48%, 9.61%, 42.62%, 0.49% respectively. The conversion of CH4 and CO2 reached 45.9% and 51.09%, respectively. There were all kinds of reactions during the processing of reforming of pyrolysis gas. And the main reactions changed with the operation condition. It was due to the promoting or inhibiting interaction among different constituents in the pyrolysis gas and the different activity of catalysts in the different operation condition. (C) 2015 Elsevier Ltd. All rights reserved.