Abstract: Reviewed the steel industry CO2 emissions from domestic and international research literature in recent years, established the carbon flow model of the steel production process; summarizes and analyzes the impact of CO2 emissions from integrated iron and steel factors; introduced abroad by reMIND and CLPEX integrated optimization of the process of establishing the cost of production and CO2 emissions model; summary of the steel industryCO2 emissions estimation methods and precautions; make our steel industry should accelerate the establishment of the current domestic steel industry for calculating greenhouse gas emissions standards and methods; prospect of reducing CO2 emissions from iron and steel industry's research directions.