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The current fire fighting robot accomplishes mostly assignments independently, which cannot meet the demand that managers in remote terminal mastery the real-time information of fire scene. Aiming at this problem, this paper designs and implements the mobile robot remote fire alarm system, which is composed of two parts: mobile robot and remote terminal. Modules of the two parts which consist of control module, communication module, flame detection module, remote terminal display module are designed in this paper based on the analysis of system structure and experimental platform. STC89C52 is taken as processor of mobile robot and remote terminal, while photoelectric sensors, infrared sensors and other sensors are combined as the detecting system. The software system designs and implements the algorithm of fire detection, robot's line-tracking, wireless communication and other algorithms, which improves system flexibility and adaptability. The experimental result shows that mobile robot with the ability of accurate fire detection and line-tracking can send the remote terminal real-time information of fire, which can be analysed and processed by the remote terminal to alarm. So it has widespread application value.