CO is one of the typical air pollutants，which is harmful to the human body and the ecological environment. With the successive introduction of CO pollutant control policies and the proposal of the concept of dual carbon，the country’s governance of CO emissions has become more and more in-depth and strict. Aiming at the problem of CO generation in sintered flue gas caused by incomplete combustion of fuel，this paper mainly conducts industrial tests on the sintered flue gas of a steel plant from two aspects: reducing fuel consumption in the sintering process and improving the oxidation atmosphere of the sintering process. The former adopts such measures as improving fuel particle size，optimizing fuel structure，thick material layer sintering，fuel lamination addition，reasonable ore distribution，flue gas circulation and increasing mixture temperature. The latter adopts oxygen-rich ignition，steam spraying on the material surface，improving the air permeability of the material layer and reducing the air leakage rate. Through the implementation of various measures，the burning consumption of sintered solids in steel plants has been gradually reduced from 49 kg /t to 44 kg /t，and the CO concentration in sintered flue gas has been reduced from 6 000 mg /m³ to less than 4 000 mg /m³ .