The assessment of the beverage aluminum can in Japan (350 ml, 16.2g) was carried out, and the lifecycle material flow was analyzed. On the basis of the flow, LCI (Life Cycle Inventory) software for the beverage aluminum can has been developed, which is able to change several key parameters such as the UBC recovery ratio (UBC: Used Beverage Cans) and the can to can ratio (UBC used for can manufacturing divided by all of UBC), etc. Lifecycle environmental loads of aluminum cans were analyzed for four kinds of situations by changing these parameters. They are the past (UBC recovery ratio = 67.5%, can to can ratio = 45.7% in 1995), the present (72.6%, 73.3% in 1997), the target (80%, 80% in 2002) and the theoretical limit (100%, 100 %). The consumed energy per one aluminum can for each situation was estimated at 668.6 kcal in 1995, 555.8 kcal in 1997, 503 kcal in 2002 and 329.5 kcal in the theoretical limit. It has been brought out that both of the UBC recovery ratio and the can to can ratio should be increased for the purpose of the reduction of the environmental loads cased by the aluminum can manufacturing.