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High functionality given to steel products results in an increase of environmental loads in the steelmaking stage.However,at the stage of their utilization,the high-functional steel products prove to be more environmentally friendly than their conventional counterparts in many cases.In view of this contradiction,the evaluation on the contribution of steel products to environmental improvenent requires a more integrated approach-Life Cycle Assessment ( LCA ),which incorporates the effects over the products entire life cycles.This paper discusses the relationship between the improvement of steel products performance and the according environmental impact from the entire life cycle perspectives.How to evaluate and assess the contribution of high-functional steel products to environmental improvement using LCA method is explained in detail.Two case studies of Baosteel are given to substantiate the effectiveness of LCA as a scientific and systematic method for eco-material evaluation or eco-design:① For a power transformer,by replacing silicon steel B30G130 with B30P110,the carbon dioxide emissions were reduced by 15.1％ over the life cycle of the transformer.② Tinplate steel of Baosteel used for two-piece steel cans experienced six reductions in thickness from 0.28 mm to 0.225 mm,which results in a 14.5％ emission reduction over the life cycle of two-piece steel cans.