Using butt emission infrared sensors,radio receiving and sending modules,double function integrated circuit with code and code translation,LED etc,a digital acoustic burglar alarm system using infrared radio to realize remote control was designed.It uses infrared ray invisible to eyes,composing area of radio distance.Once people and objects shelter the infrared ray,a testing signal will be output by the tester,and the sender will be triggered to work.The radio coding signal that sender sent is received by the receiver,then processed by a serial circuit.The control signal is output to trigger the sounder to give out an alarm signal,and the operator will be cued to notice this variation.At the same time,the digital display will be lighted and the alarm place will be watched.Digital coding technology is used,and a number of sub alarm circuits can joint the main receiver,so a lot of places can be monitored.The whole system features a module structure,with the property of easy alignment,stable operation,debug free and so on.The system offers an alarm range reaching 1 000 meters in all directions,and can be widely used in family,shop,storehouse,orchard and so on.