Submarine is applied widely in naval war and this urges navy in every country develop anti-submarine equipments and weapons. The airborne blue-green laser anti-submarine becomes a new method. In this paper, the basic principle of airborne blue-green laser anti-marine technology and work process are introduced firstly, and then the system constituents are analyzed. The performance demand of laser transmitter, receiver and maximum depth and depth detection accuracy are discussed. The results proved that detecting submarine by laser is efficient, especially in the shallow sea which is only several decameters deep.