How to effectively apply NOx control technology to the biomass combustion process has become a current research hotspot. Aiming at the characteristics that the nitrogen oxides produced in biomass combustion process are mainly from the nitrogen element of biomass fuel, this paper adopts the fuel classification - zone reduction method to control NOx. Firstly, the reaction behavior, kinetic characteristics and optimal reduction parameters of NO reduction by coke were explored in a fixed-bed reactor. And then, the elemental analysis, pore analysis, scanning electron microscopy and other characterization methods combined with reduction experiments were used to study the changes of physical property parameters, reduction capacity and denitrification efficiency of coke after loading Fe based catalyst. By understanding the NO-carbon heterogeneous reduction process, the optimal conditions for enhancing reduction efficiency will be revealed, such as temperature, oxygen content in flue gas, and catalyst loading. The findings will provide a theoretical basis and technical support for implementing carbon reduction in low-nitrogen biomass combustion.