His study intends to explore the major affairs, which public fire departments should face to take care of in order to achieve the goals of fire fighting. After adopting cases study, this paper finds eight categories and forty-four items of major affairs of fire fighting operations for public fire departments including to mobilize fire fighting resources, to prepare to fight the fire, to reduce the loss of the fire, to smooth the damages of the fire, to improve fire fighting effectiveness, to maintain order of fire ground, to keep peace for the social, and to do the recovery.