With more attention has been paying to environment, Environmental Strategy becomes a new trend of enterprise management. The paper studies the origin and some main points of environmental strategy. By describing three steps to environment responsibility experienced by US steel industry, Minimum Cost, giving attention to both cost and benefit, and efficient environmental control, the paper tries to give a further understanding on enterprises how to choose environmental strategies in different developmental process. The aim of the research is to prepare for the following researchers and practicers to acquire further understanding of Environmental Strategy.