Sintering flue gas is the largest emission source of pollutants in the iron and steel industry. At this stage，the metallurgical desulfurization and dust removal process is gradually mature，but the removal of NO_x is still in its infancy. Some enterprises have excessive NOx emissions. With the further improvement of environmental protection indicators，optimizing NO_x treatment process，reducing NOx emissions in metallurgical flue gas has become the top priority of pollution treatment in the iron and steel industry，which should be paid more attention. The mechanism of N in the sintering process was introduced. Volatile nitrogen participates in the redox reaction. The high temperature and low oxygen conditions promote the reduction reaction to generate N₂ and inhibit the formation of NO_x. At the same time，high temperature promotes the coke nitrogen adsorption capacity and heterogeneous reduction reaction;The characteristics of sintering flue gas were summarized. Its composition is more complex，the content of pollutants is high，the water content and the oxygen content are large，and the lower flue gas temperature leads to lower requirements for the temperature window of the SCR catalyst. These features further restrict the development of sintering flue gas treatment;The existing problems of current several typical denitrification processes and sintering flue gas denitrification technology were compared and analyzed. SCR denitration method is the current mainstream denitration process. The catalytic active components and performance of the catalyst are the core and key of the technology，and it is also a research hotspot in recent years. The new iron-based low-temperature catalyst of γ-Fe₂O₃ containing iron-containing dust is a feasible research direction of denitration catalyst，which has the characteristics of resistance to alkali metal poisoning，good low-temperature catalytic activity，and economical reliability and can further expand the scope of metallurgical resources utilization;The development direction and new technology of denitration were prospected. The research of plasma denitrification and microbial denitrification started relatively late，but due to its smaller effects of flue gas temperature，it can achieve better denitrification effect and has excellent development prospects，but there are several problems that have not been applied in engineering;Improved technology such as the introduction of flue gas recirculation，air staging combustion，low-oxygen combustion and other combustion control technologies can coordinate the flue gas denitration process after sintering by optimizing the structure of the sintering mixture，such as enhanced granulation effect，thick material layer and high basicity sintering，etc. Flue gas NOx emission concentration;The hierarchical treatment of sintering flue gas has disadvantages such as high investment and operation cost and large area. It is of great significance to develop a reliable，cost-effective and integrated desulfurization and denitrification process. The desulfurization process coupled with SCR denitrification is an important direction for the treatment of sintering flue gas pollutants. By referring to the recent research on some new desulfurization and denitrification technologies and new ideas，the process flow of flue gas recirculation + CO catalytic oxidation + SCR denitrification + CFB/SDA desulfurization is put forward，which can provide some reference for the research and development of denitrification technology in steel works.