Aiming at mine collapse,we design a Fiber Bragg Grating（FBG） sensor network to monitoring the mine.Firstly finite element analysis is made to the mine model to get the instable point in real-time.Then specially designed FBG sensors are installed at the instable points of the mine.When an instable point of the mine is abnormal,the reflected grating center wavelength will change.According to the center shift of the reflected light,the security situation of the mine can be well mastered.Experimental results show that the measurement accuracy of the FBG sensor can reach ±0.01%.