Abstract: The resource utilization of CO₂ in the steel production process plays an important role in the completion of China's CO₂ emission reduction. Taking the resource utilization of CO₂ in the steel industry as the starting point, the application status of CO₂ at home and abroad as reaction gas, stirring gas and protective gas in steel production process was analyzed. CO₂ is used as a reaction gas mainly in BOF converter steelmaking, stainless steel production and steel slag carbonation; CO₂ is used as a stirring gas mainly for converter bottom blowing, ladle mixing and LF furnace refining; CO₂ is used as shielding gas mainly in tapping, tundish and continuous casting and other processes. The use of CO₂ for steel production has the advantages of low cost, good thermodynamic conditions, high density, strong stirring ability and utilization of CO₂ resources. The utilization of CO₂ in the reaction system after CO₂ injection needs further study.