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采用微波放电NO-O2-H2O-He体系脱除NO的反应模型，对NO脱除及其转化进行分析计算。通过建立并数值求解化学反应动力学方程组，对NO-O2-H2O-He体系微波直接分解脱除NO过程进行反应动力学研究，分析影响NO脱除效率及其向N2和NO2转化的各种因素及规律。计算结果表明，在NO-O2-H2O-He体系中，微波功率，NO、O2和H2O的初始浓度等对NO脱除效率有较大影响，即微波功率的增大有利于NO的脱除及其向N2的转化；NO初始浓度的增加降低了体系的微波脱硝效率；脱硝效率随着模拟烟气相对湿度的增加而增加；微波放电条件下，O2的加入可增加产物中NO2的生成量；微波放电NO-O2-H2O-He体系脱除NO为还原和氧化反应共同作用的结果，NO转化为N2的效率总大于其转化为NO2的效率。“,”The removal and transformation of NO were analyzed and calculated through using the Kinetic model of removing NO in NO-O2-H2O-He mixtures by microwave discharge. Through establishing and the numerical solution of chemical reaction dynamics equation set, the Kinetics of reaction removing NO in NO-O2-H2O-He mixtures by microwave discharge was studied by building and solving the chemical reaction kinetics equations, various influencing factors for removing NO and the transformation laws of which NO converted into N2 and NO2 was analyzed. The results show that in NO-O2-H2O-He mixtures, the removal efficiency of NO is influenced by microwave power, NO initial concentration, O2 and H2O initial concentration, and so on, in which an increase of microwave power is advantageous to the removal of NO and the conversion of NO to N2; The efficiency of denitrifieation decreases with volume fraction of NO increases, and it increases with simulated flue gas humidity increase; The NO2 generation increases by the addition of O2 under the condition of microwave discharge; Removal of NO in NO-O2-H2O-He mixtures by microwave discharge is a result of both the reduction reaction and oxidizing reaction of NO, and the conversion rate of NO to N2 is more greater than that of NO to NO2.