This is the infrared thermal release alarm based on introduced the development history, infraredtechnology application, development trend and researchsignificance; then analyzed the basic principle of infraredalarm system, and comprehensively introduces theimplementation of SCM infrared heat release alarm systemneed based hardware and software; then introduces the implementation of SCM infrared thermal release alarmsystem hardware circuit design and software structurebased design; finally, test and analyze the performance of the whole whole system is divided into hardware design and software design of two modules. Using the hardware part of the STC89C52 microcontroller, infrared probe, and the alarm circuit, LED control circuit and other components;software and hardware environment of choice is keil. This system uses the pyroelectric infrared sensor, it has the advantages of simple manufacture, low cost, installation is convenient, and the anti-theft performance is relatively stable, strong anti-interference ability, high sensitivity, safe and reliable. This kind of security installmenthiding, not easy to be found by thieves, the signal processed by SCMis convenient and PC communication, to facilitate unified user : single chip; infrared sensor; alarm circuit;百度翻译的别打我