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As the unceasingly development of progresses economic, the growth of population, the lands are less along with time. In order to increase the spatial availability and spatial convenience, several illegal building and sheet metal houses were built in many cities. Furthermore, since the advance of construction technology and engineering method, the sheet metal houses become larger, more complex and diversify. These situations largely increased the hazard of fire, stopping people from getting out of the building and fire rescue. However, a key question is why the damage of fire still serious, even the buildings had erected fire equipment. First of all, the fire equipment could not prevent the occurrence of fire, it only could alarm people and extend the escaping time; Second, the fire equipment was designed for beating out the fire with fireman. Although the sprinkler system might beat out the fire immediately as fire occurrence, the factories did not require to set up sprinkler system. Therefore, a well-designed fire alarm system might decrease the damage of fire and achieve effective hazard management. In addition, integrating other components with the fire alarm system for more diversified and low-cost might promote more people to utilize this system for taking precautions against fire.
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