Abstract: ABL is a typical application system of very high energy laser, with the property of high motorized, high accurate and lightning attack to the goal,and also with the ability to deal several objects a crushing blow. This system applies to any complicated environments and can win military and political victory at minimum and resumable damage. However, ABL is also a system that USA invests plenty of manpower and material to give priority to its development. The history, composition and develop ment of ABL are introduced the technical development in recent years and excellent performance in the battle field are described.