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An experimental study on the conversion of NO in the NO/O2/N2 system has been carried out using Dielectric Barrier Discharge (DBD) Plasma at atmospheric pressure. The emphases are on energy consumption and the efficiency for NO conversion in the system. By measuring the concentration of NO and NO2 as a function of specific energy density (SED), it is possible to determine the energy consumption for NO conversion and the effect of O2 concentration and NO initial concentration on the efficiency for NO. It is conformed in this study that NO to NO2 is the main reaction in the NO/O2/N2 system; the efficiency for NO conversion is reduced with the increase of O2 concentration, the yield of NO2 increases with the increase of O2 concentration; initial concentration of NO is smaller, the efficiency for NO conversion is higher. When initial concentration of NO is 260times10-6 in the system, 75-95% NO can be conversed in the SED range of 440-700 J/L.