Abstract: A mathematical model of CO₂ emissions in iron and steel enterprises was established, and based on production data from a domestic steel plant, the amount of annual CO₂ emissions of the steel plant was calculated by using this model.The influences of the used energy types and the produced steel types on CO₂ emissions were discussed.Scenario analysis was conducted to analyze the effects of different ways and strategies on the reduction of CO₂ emissions, with four scenarios assumed:using natural gas instead of all the steam coal, using EAF processes to replace integrated steelmaking, considering feasible lowest process energy consumption(FLPEC) and applying waste heat recovery technology.The result shows that the using of waste heat recovery technology has little effect on CO₂ emissions, and only 3.39% of CO₂ emissions would be reduced;however, using EAF processes to replace integrated steelmaking has the most effective impact on the reduction of CO₂ emissions, it would reduce 45.07%, and even if indirect CO₂ emission, which is caused by EAF electricity consumption, is counted, the reduction of CO₂ emissions would still reach 24.30%