Abstract: activated coke is an excellent pore structure material. The desulfurization and denitration performance of activated coke at medium and high temperature has been studied extensively by predecessors,but the denitration performance of activated coke at low temperature (<100 ℃) has been rarely studied. In order to study the characteristics of NO removal by activated coke at low temperature,simulated flue gas was prepared according to the actual flue gas group of pulverized coal industrial boiler,and the test bench of fixed-bed reactor was built. The influence of process conditions on NO removal efficiency of activated coke was studied by changing the parameters such as temperature,oxygen concentration,SO_2 concentration and moisture. The microstructure and surface chemical properties of the activated coke before and after the reaction were characterized by FT-IR,in-situ IR,TG-DTA,photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The experimental results show that at 50-90 ℃,the lower the temperature is,the higher the oxygen concentration is,and the higher the NO removal efficiency of activated coke is. The presence of SO_2 and water is not conducive to the removal of NO by activated coke. SO_2 has strong polarity and will compete with NO for adsorptive sites and active sites. Water will form a layer of water film on the surface of activated coke,which makes the activated coke toxic. Physical adsorption and chemical catalytic oxidation take place simultaneously in the NO removal of activated coke at low temperature,and physical adsorption is the main process. Physical adsorption depends on the rich microporous structure and excellent specific surface area of activated coke. Chemical catalytic oxidation depends on free oxygen in flue gas and oxygen-containing functional groups on the surface of activated coke. The initial desorption temperature of NO is 150 ℃,the highest desorption concentration is observed at 225 ℃,and the desorption complete at 600 ℃. The initial desorption temperature of NO_2 is 175 ℃,the desorption concentration reaches the highest at 225 ℃,and NO_2 is completely desorbed at 500 ℃.