In order to investigate the influence of oxygen content in sintering flue gas on the heat generated by coke combustion and sintering flue gas , the thermodynamic calculation was carried out with FactSage software. Combustion kinetics under different oxygen content was studied with thermogravimetric analyzer. Thermodynamic research results showed that under the condition of sintering with iron ore fines, the oxygen content in the combustion-supporting air was abundant. When the oxygen content was more than 7%, the solid fuel in the sintered layer could meet the combustion conditions and release all the heat. Kinetic experiment results showed that the combustion rate of coke breeze in 5 minutes with 13% oxygen content in flue gas was equivalent to combustion rate of coke breeze of in 2.75 minutes21% oxygen content in flue gas. Therefore, if the combustion time was long enough, the heat released by low-oxygen flue gas would be basically equal to that of high-oxygen flue gas.