A detection system based on Fiber Bragg Grating sensing technology that can be used in the detection of bastion safety is designed and achieved．the Fiber Bragg Grating sensing technology is described and the possibility of its using in the detection of bastion safety is analyzed．The F-P demodulation method based on the ARM9 is advance to use in this system．With the controlling center of S3C2410A,the main parts of the demodulation system are designed．According to its special using place,some idiographic packing methods are pointed out．And a multi-channel reuse mean with cycle-scan is also adopted to realize the large-scale and multi-parameter detection system.Through observing and analyzing the data of relative experiment,the results of detecting temperature and strain by using Fiber Bragg Grating sensing technology are known．According its disadvantages in the practical martial use,some improved methods and development direction in the future are advanced．