Low-temperature NH3-SCR is an important technology choice for flue gas denitrification in non-electricity industries with lowexhaust temperature, and low - cost carbon materials with good structural tunability are one of the most promising low - temperatureNH3-SCR catalysts, but face the bottleneck of low denitrification efficiency. In this paper, based on a one-step catalytic activationprocess, activated coke catalysts with typical pore configurations and nitrogen-containing functional groups were prepared from low-costand large-volume Jundong coal as raw materials, and the effects of activated coke pore configurations and surface functional groups on thelow- temperature NH3 - SCR under different flue gas conditions were investigated. The results showed that both graded pores andnitrogen-containing functional groups have significant effects on NH3 -SCR, and the nitrogen-doped graded-porous activated coke withboth graded pores and nitrogen-containing functional groups has the optimal performance of NH3-SCR due to the simultaneous improvement of the mass transfer channels and reaction kinetics, and its denitrification efficiency reaches as high as 83.5% under the condition of160 ℃ . The enhancement effects of graded pores and nitrogen-containing functional groups on the NH3-SCR performance are more obvious in the presence of SO2 or H2 O, and the denitrification efficiency of microporous activated coke decays from 39.6% to 13.8% and34.9%, whereas the denitrification efficiency of nitrogen - doped graded - porous coke improves to 86. 4% and 86. 7%, respectively.This may be related to the synergistic effect between different flue gas components enhanced by the functionalized graded pore environment.In this study, the dependence between the performance of carbon-based low-temperature NH3 -SCR and the physicochemical structure ofthe carbon materials was investigated, which provides a new idea for the development of high-performance carbon-based low-temperatureNH3-SCR technology.