Abstract: Based on the characteristics of CO₂ at high temperature, material and energy models for CO₂ using in a dephosphoriza-tion converter were established to verify the feasibility of CO₂ for oxidation reactions. Based on practical working conditions in a facto-ry, the effects of CO₂ on the converter temperature and gas were studied. It is discovered that the CO₂ ratio can be controlled within 28%, the oxygen consumption can be reduced by 16%, and the CO ratio in the gas can be increased by about 12% when the scrap ratio is 8% and the utilization ratio of CO₂ is 85%. Besides, as the utilization ratio of CO₂ increases, the semi-steel temperature of the converter gradually decreases, and the oxygen consumption also lowers.