Based on the fundamental principle of FBG sensors,the effects of degeneration of Fiber Bragg grating(FBG) sensor,optical fiber link and the degeneration of light source on the multiplex demodulation were analyzed,and the method that uses self-adapting threshold to resolve the effects was proposed.The analog simulation and experiment research show that correlation theory is validity and the method is feasibility.Experimental results show that the error rate of the multiplex demodulation result reduces from 1...