The perimeter of project site is 10km long. A total of 50 defense areas are designed and comprehensive protection measures such as network-type fiber optic vibration cable alarm system, video surveillance system, broadcasting system and lighting system are taken by the perimeter protection system. A total of 23 sets of network-type fiber optic vibration cable collectors, 5 sets of thirty-two alarm relay output linkage devices and 4 sets of four-way switch signal acquisition and alarm relay output linkage devices are utilized.