Abstract: With increasingly rigorous emission standards for industrial furnaces in the steel industry, multiple standards targeting ultra-low NO_x emissions from reheating furnaces for rolling mills have been introduced successively. The permissible NO_x concentration limit has been gradually reduced from 300 mg/m³（before 2020） to 50 mg/m³（at 8% O₂ reference）. However, the process of controlling NO_x often leads to reduced operational efficiency of the furnace, thereby limiting the production capacity of hot rolling.This paper focuses on the formation mechanisms and control measures of NO_x in reheating furnaces for rolling mills. The influence of staged combustion on NO_x formation was studied through simulation, and experiments were conducted to analyze the impact of oxygen concentration on both measured and converted NO_x values. Furthermore, the feasibility of applying SNCR high-temperature denitration technology in reheating furnaces was examined based on their operational characteristics.The results show that by enhancing staged combustion, optimizing the combustion atmosphere, and implementing furnace temperature limitation measures, NO_x emissions can be reduced from about 200 mg/m³ to below 100 mg/m³. Moreover, the application of SNCR high-temperature denitration technology can further lower NO_x emissions from around 100 mg/m³ to below 50 mg/m³.