This research based on microcomputer. We using the VISUAL BASIC language of the program, through the 8255 I/O interface card and the sensor circuit to smoke, temperature and the liquid of ground floor to do supervise and control. The function not only provides to emission the smoke, sprinkle water and warn, but also warns near by person and car through the infrared ray to trigger the alert device. The message can send to the center of the firefight through the Internet net. Hence, we can shortening the alert time and reduce the loss of the property and the life. The result of this research is given satisfaction.