本文讨论了基于MC14468 离子型烟雾检测报警器、单片机8051、单片射频收发器构成的火灾自动报警系统。由于引入了无线通信技术和以调制解调技术为核心的nRF401 射频收发器，使系统的性能大大提高，尤其是使系统报警更具实时性和可靠性。关键词：MC14468；8051；nRF401；火灾报警Abstract: This paper discusses the automatic fire giving an alarm system based on smog detection device, single chip 8051 and single chip frequency emitter. Because of the importing of wireless correspondence and the frequency emitter nRF401 that modem is its core, the system function is greatly improved, especially the system has high characters of real time and credibility.Key words: MC14468;8051;nRF401; fire giving an alarm