Abstract: A experimental study of characteristics of NO reduction by a simulating production gas of biomass gasification was performed in a ceramic flow reactor heated by an electric furnace. The gas was composed of CO, CO2, CH4, H2 and N2, and the temperature used in the experiments ranged from 1000℃ to 1400℃. The influence of the inlet concentration of oxygen (0%～5%), the local equivalence ratio, φ(0.5～2.28), and the reactor temperatures was studied to analyse the characteristics of biomass gasificationreburning. The results indicate that more consumption of reducting agent is needed to increase the NO reduction efficiency in pyrolysis condition. The suitable values of the local equivalence ratio, φ, could make the NO reduction efficiency in oxidation condition higher than that in pyrolysis condition. The local equivalence ratio is an important parameter for NO reduction, and higher NO reduction efficiency can be obtained when 〖φ varies between 0.8 and 1.1. The reduction of NO is favored at high temperatures.