The system is composed of Fire center console, wireless control board, wireless multifunctional fire detector and wireless PTZ camera control system. It is based on string-like network topology self-organizing wireless sensor networks, which adopts Simplici TI network protocol that can reduce power consumption of the system. The system uses BP algorithm program for judging whether there is a fire, uses Wireless PTZ camera control system, which is convenient to install, for real-time monitoring the detect area, uses voice module for fire automatic voice alarm to the fire department and uses Micro-Fire GIS to show the location of a fire. BP algorithm program is embedded in wireless multifunctional fire detector. The samples of BP algorithm were derived from the fire detection standard room of the State Key Laboratory of Fire Science of China. The system is low false alarm rate, low cost, fast response and convenient to install.