Foam extinguishing system has the features of safe, reliable, economical, practical and high extinguishing efficiency. It is applicable to the extinguishments of fire in class A and B, with superiority in the extinguishments of fire in class B. Low-power foam extinguishing system is applicable to the extinguishments of fire caused by flammable or combustible liquid container or large area floating fire. It is mainly used in the production, storage, transportation and application places of flammable and combustible liquid, such as petrochemical enterprise, oil depot, loading and unloading platform, wharf, oil extraction platform, hangar, garage and other places with high dangers. High-power foam extinguishing system has the features of high foaming times, small loss of water stain, high anti-reburning capacity and low cost. It is used to extinguish fire in class A and B inundation and coverage. It can also be used to effectively control floating fire caused by liquefied petroleum gas and liquefied natural gas. It is mainly used in solid materials warehouse, flammable liquid warehouse, industrial house (or workshop) with fire danger, underground building works, the engine room and pump room of ships and vessels, places storing precious instruments and materials as well as places with the danger of floating fire caused by flammable and combustible liquid and liquefied petroleum gas and liquefied natural gas.