The security of home, laboratory, office, factory and building is important to human life. We develop an intelligent multisensor based security system that contains a fire fighting robot in our daily life. The security system can detect abnormal and dangerous situation and notify us. First, we design a fire fighting robot with extinguisher for the intelligent building. The fire fighting robot is constructed using aluminum frame. The mobile robot has the shape of cylinder and its diameter, height and weight is 50 cm, 130 cm and 80kg. There are six systems in the fire fighting robot, including structure, avoidance obstacle and driver system, software development system, fire detection, remote supervise system and others. We design the fire detection system using two flame sensors in the fire fighting robot, and program the fire detection and fighting procedure using sensor based method. We design a low cost based obstacle detection module using IR sensors and ultrasonic sensors in the mobile robot. The man-machine interface of the fire fighting robot must be mobility and convenience. We use touch screen to display system status, and design a general user interface (GUI) on the touch screen for the mobile robot. Finally, we implement the fire detection system using fire fighting robot. If fire accident is true, the fire fighting robot can uses two flame sensors to find out fire source by the proposed method, and move to fire source to fight the fire using extinguisher.Keywords：fire fighting robot、man-machine interface、touch screen

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