In order to overcome the problems of existing technology of low resolution

limited mornitoring distance and high price

provide behaviors of perimeter intrusion sensing technology and system sensitivity enhancement method based on fiber Bragg grating sensor（ FBGS） array. Using the whole grating array technology to improve the multiplexing capacity of system

the number of the same length zone sensor increases exponentially

thus greatly improves the sensitivity of the system to perceive the external intrusion. The sensitivity of the system is further improved by adopting special package and laying technology. Combining the time domain and frequency domain analysis methods

the system can intelligently identify the outside intrusion behavior

and the false positive rate is decreased. Compared with the traditional fiber grating perimeter anti intrusion technology

the system has the characteristics of m class space resolution

low false positive rate

long monitoring distance and high cost performance.