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Tank fires, whose main harm is the heat radiation, bring not only great economic losses to an enterprise and great threat to people's life and property safety, but also serious pollution to the environment. The way to keep a tank fire from spreading is cooling nearby tanks to prevent them from igniting. In the process the key is the reasonable infliction of cooling water intensity to the tank nearby. Through analyses of heat transfer characteristics of the tank on fire and those nearby, this article has established first a model of heat transfer from the tank on fire to nearby tanks by building up an equation between the total heat a nearby tank absorbs and the heat absorbed by its wall, the oil inside and cooling water, and then established a calculation model of the cooling water intensity of adjacent tanks.