As a main public transportation hub, airport have the characteristics of large scale, high investment, many facilities and equipment, complex operation, dense personnel, great political and economic impact, so its particularly important to guarantee theirs safety.
In recent years, its very serious for the security situation in the flight area. There have been many incidents happened in domestic airports, some intruders broken through the physical fence of the flight area and sneak into the runway, caused aircraft danger and even casualties. Because of it, Chinese General Administration of Civil Aviation clearly stipulates that, all of the Class 1st (annual passengers throughput of 8 millions or more) and Class 2nd airports (annual passengers throughput between 2 millions to 8 millions) must be installed the Intrusion Alarm System for the perimeter security, and suggest the Class 3rd airports to install the intrusion alarm system for the perimeter security (annual passengers throughput from 50 and 2 millions).