Recently, Life Cycle Assessment(LCA) attracts public attention as one of the most widely used technical methods for evaluating environmental impacts associated with the life cycle of a product system. In this paper, a LCA study was carried out to access the environmental impact of a beverage can system throughout its entire life cycle. The life cycle of 250m1 2 piece-can is chosen as a product system to be studied, and 250 ℓ of beverage are defined as the functional unit. For Life Cycle Inventory Analysis(LCI), the process trees for the life cycle of 250㎖ 2 piece-can are constructed by connecting individual unit processes. Then, the life cycle inventory table for the present product system is established by identifying, quantifying, normalizing, calculating, and aggregating all the inputs and outputs related to each unit process based on the defined reference flow(1000 pieces of 250㎖-can). A number of inventory parameters identified in the inventory table are converted into environmental impacts by conducting Life Cycle Impact Assessment(LCIA), where classification, characterization, and valuation are carried out. It turns out that CO₂ is the most problematic emission throughout the life-cycle of steel can system and the use of electricity in the manufacturing stage of steel can Is the biggest source for the total emissions associated. In particular, the electricity is responsible for about 22% of CO₂ emission which may cause the global warming effect.