Abstract : This paper introduces the design method, hardware and software composition and implementation of the automatic fire alarm control system. The CAN bus structure is used in the system design to realize the communication between the host computer and the slave computer, so as to realize remote control and extinguish the fire at the source. Engineering practice shows that the system has high reliability, strong flexibility and human-machine interface. Keywords : CAN bus; real time; fire alarm system 1. Introduction CAN (Contral Area Network) bus is a serial data communication protocol developed by BOSCH in Germany in the 1980s to solve the data exchange between many control and test instruments in modern automobiles. Because of its unique design, high reliability and low price, it is widely used in many fields [4]. Fire alarm system generally consists of fire detectors and controllers. Among them, fire detectors are special instruments to identify whether a fire has occurred. When a fire occurs, it will produce smoke, high temperature and flame, and the detector is very sensitive to these. When smoke, flames, or high temperatures are generated, the detectors convert these non-electrical parameters into electrical parameters, causing changes in current and voltage. After A/D conversion, the data is transmitted to the controller. When the data exceeds the system's designed threshold, the lower-level machine transmits information to the upper-level machine, which then emits an alarm sound through a speaker to notify the on-duty personnel. Simultaneously, the lower-level machine controls the system's alarm to emit an alarm signal, warning on-site personnel. The lower-level machine transmits the information to the PC via the upper-level machine, displaying the location and extent of the fire. Based on the physical phenomena exhibited during a fire, fire detectors can be categorized into five main types: gas-sensitive, heat-sensitive, smoke-sensitive, light-sensitive, and sound-sensitive. Different types of fire detectors are installed according to the requirements of the building or the actual location. To improve system reliability, this system uses a combination of smoke detectors and infrared heat sensors. The fire situation is determined through both smoke and heat detection. Furthermore, these two sensors are resistant to electromagnetic interference, moisture, and corrosion, further improving detection accuracy. [Full text download of research on CAN bus-based fire alarm control system]