Abstract: Abstract：Two-step method was employed to removal the NO in flue gas.Firstly，NO was fixed by complex absorpion with the solution of FeⅡEDTA，and then NO can be oxidized to NO^3- by H₂O₂.In order to regenerate the absorption liquid，the pH of the solution was adjusted to 4.0，and then add Fe powder to deoxygenate FeⅢ to FeⅡ，so that it can keep on absorbing NO.In the experiments，some factors，such as the pH of the FeⅡEDTA solution，concentration，temperature，and the amount of H₂O₂， which may affect FeⅡEDTA absorbing NO and further oxidating NO to NO^3- were studied.Results showed that the oxidation efficiency of NO can reach 83.8%，when FeⅡEDTA（0.13 mol/L） was used to absorb NO and add H₂O₂ as the oxidizer later， the concentration of NO^3- was 0.109 mol/L finally.After five recyclings of the absorption liquid，EDTA，molysite，and nitrate etc.，can be recovered by adjusting the pH to achieve comprehensive utilization，and the recovery rate of EDTA was 93.1%.

Key words: NO, FeⅡEDTA, H₂O₂, comprehensive utilization, flue gas deNOx