紫禁城的报警系统是由城门外的宫阙与午门内的火焰形望柱组成。明代,修建紫禁城时,继承了历代宫阙的建置,于午门两翼修建了呈“凹”字状的燕翅楼,以便设人了望,守卫宫城。清代,又在此基础上有所发展,将宫阙与紫禁城内金水桥两侧的协和门和熙和门旁的火焰形望柱头连为一体,形成严密的报警系统。火焰望柱头即紫禁城内的报警装置。其构造是将火焰 The Forbidden City’s alarm system consists of a palace-fire outside the city gate and a flame-shaped pillar inside the Meridian Gate. Ming Dynasty, the Forbidden City, the succession of the establishment of the palace of the ancient dynasties, the wing was built in the two wings was “concave” shape of the House of the wolf in order to set people looking to guard Miyagi. During the Qing dynasty, on the basis of this, some developments were made, linking the palace with the Concorde on both sides of the Jinshui Bridge in the Forbidden City and the flame-shaped stigma beside Hee Hee Gate to form a tight alarm system. Flame hope stigma that the Forbidden City alarm device. Its structure is to flame