PROBLEM TO BE SOLVED: To provide a mixed phase mist spray system for spraying mist mixed with a large amount of air without wetting an indoor wall or article. SOLUTION: The mixed phase mist spray system is equipped with a microbubble producing device for producing microbubbles of air in a liquid, a liquid pressurizing device for pressurizing the liquid mixed with the microbubbles and a sprayer for spraying the pressurized liquid as fine particulate mist mixed with the microbubbles by an one fluid system. COPYRIGHT: (C)2008,JPO&INPIT