Abstract: In recent years,the integrated removal technology of multi-pollutants by ozone has been successfully applied in air pollution treatment.Ozone,as one of strong oxidant,can not only realize NO deep oxidation in flue gas,but also remove trace heavy metal Hg by oxidation.In this paper,the kinetics reaction mechanism of ozone and multi-pollutants was established and the simultaneous removal of NO_x and Hg by ozone in waste incineration flue gas was investigated by using Chemkin Pro software.By analyzing the sensitivity coefficient of NO and Hg and O_3 reaction,the key elementary reactions of NO and Hg oxidation by O_3 were obtained,and the reaction pathways of NO and Hg oxidation were also proposed.Besides,the effect of reaction temperature,O_3/NO molar ratio and reaction time on NO_x and Hg removal were also studied by changing the initial parameters. The modeling results show that the NO and Hg oxidation efficiency increases with the increasing O_3/NO molar ratio.The reaction temperature plays an important role on the process of NO deep oxidation by O_3 and the process of Hg oxidation removal.The low reaction rate at too low temperature leads to longer reaction time,while too high temperature resultes in the decomposition of intermediate species,thereby reducing the removal efficiency.The reaction time of NO deep oxidation to N_2O_5 is much longer than that of primary oxidation to NO_2.The reaction time for NO deep oxidation is about 5-8 s under the optimal reaction temperature 60-80 ℃. The presence of HCl in the waste incineration flue gas is beneficial for Hg oxidation.The Hg oxidation reaction time and optimal temperature is 4-6 s and 110-130 ℃,respectively,with HgO and HgCl_2 as the finally products.