Abstract: To improve the processing ability and response speed of a distributed fire-alarm system, an advanced 32-bit microprocessor MCF5282 is introduced in the design of the main controller of the system. Describing the system architecture and design of extension circuit of hardware interface, the system information flowchart and conceptual design of software are given in detail. The system can implement the complex on-line logical computation with its high intelligence and real-time response ability. Practical applications proved that the introducing of the high-performance microprocessor into the fire alarm controller greatly improved its quality and capability for fire control.