NO is the nitrogen oxide in coal-fired flue gas,of which the tremendous emission generates great damage on natural environment as well as human health. To overcome the problems of low efficiency and high energy consumption of NO removal by Nonthermal plasma (NTP) technology,the influences of different gas flow rate,O2 content,and initial NO concentration on the NO removal in the low-temperature plasma process were systematically investigated. The results show that the highest NO treatment capacity of per unit energy consumption is 4.17 g/kWh,corresponding to the NO removal rate of 90% and the gas flow rate of 5 L/min under the N2/NO gas mixture. The presence of O2 has an inhibitory effect on the conversion of NO. Moreover,improving the output power is disadvantageous to NO removal conversely at high O2 concentration. It is found that under the 6% O2 concentration condition,the NO removal rate is less than 46%,the corresponding treatment capacity of NO per unit energy consumption is only 2.29 g/kWh. To achieve high efficiency and low energy consume of NO removal at oxygen atmosphere,the activated carbon adsorption and oxidation process was added before the NTP process. Firstly,activated carbon was used to adsorb and oxidize NO,reducing the high NO concentration entering into the NTP reactor. Then,the residual NO was deeply oxidized by low-temperature plasma technology to achieve the efficient removal of NO with low energy consumption. The results show that the removal rate of NO by activated carbon adsorption and oxidation is more than 55% using coupled process. Controlling the NTP output power to be 9.66 W,the overall removal rate and treatment capacity of NO for coupled technique can be reached as high as 90.5% and 13.58 g/kWh,respectively. Compared with individual NTP process,the treatment capacity of NO per unit energy consumption corresponding to this coupling process has been increased by nearly five times,which has a good application prospects and socio-economic value.