Iron and steel industry is one of the major industries which produce CO₂.Currently,CO₂ emission of the Chinese iron and steel industry accounts for 10% of the whole countries' CO₂ emission,and 35%—40% of big cities' CO₂ emission.The traditional production process of iron and steel consumed too much energy.This paper briefly discusses the bad effects of the greenhouse gas and the source of CO₂ in iron and steel industry.The ways to capture CO₂ in iron and steel industry of China are analyzed.