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The fine mist fire suppression system has been focus the spotlight of attention for the extinguishing fire because of the decently living environment. The droplet size of fine mist spray, the oxygen concentration of fire room, and the fire size are important parameters for the extinguishing fire. We have investigated the relationship among the droplet size of fine mist spray, the quantity of fine mist at the surrounding area of fire source, and the concentration of oxygen in the fire compartment within the various fire sizes of n-heptane. And we have cleared the mechanism of the extinguishing oil fire by the fine water mist.