To reduce carbon emissions and mitigate climate change,based on concept of carbon footprint(CF)of a product,a case study of CF for flour production in North China Plain was calculated by life cycle assessment(LCA).On the basis of CF research,carbon labels of product and countermeasures and suggestions were discussed.The results indicated that the CF of different class flour productions were 0.98-1.07kg/kg(CO_2-eq).Among CF components of different type flours,chemical fertilizer and energy consumption of irrigation were the main components,which occupied 47%and 29%of the total CF.The results would provide theoretical bases for energy conservation and carbon emission reduction in flour production in China.In the future,China should not only lower the carbon emission of the product process,but also establish the carbon label system by establishing and improving the CF of the database,developing the standards of carbon label of agriculture productions,introducing the third-party agency,integrating carbon trade market and economic market,and connecting domestic and international market to complete the whole carbon labeling system and mitigate the changing climate.