The influence of biomass gasification gas and its components on homogeneous N2O decomposition was investigated in a lab-scale vertical fluidized bed at 900 degrees C in this article. The results indicated that thermal decomposition contributed a large portion of N2O reduction. In the absence of oxygen, the N2O decomposition was increased with the rising of reburning gas content, with the order of H-2 > CO > CH4. While with the increasing of the oxygen content, the N2O decomposition was decreased using H-2 and CO as the reburning gases, while it could be increased using CH4 as the reburning gas.