The most commonly used indoor fire extinguishing systems are automatic sprinkling fire extinguishing systems. However, such systems have disadvantages of difficult to maintenance and low in reliability. The design of a composite indoor fire distinguishing system has been proposed, which consists of a fixed fire early warning subsystem and a moveable fire detecting and extinguishing subsystem. The moveable fire detecting and extinguishing subsystem is established on an automated guided vehicle. The system is fully autonomic, robust, and easy to maintenance. In addition, it can promptly and precisely detect fire in its early stage, and extinguish it in time. Experiments have demonstrated that the system is applicable.