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there are some problems in the application of fiber grating sensor system, such as Strain weak and unstable for reliability So, we studied and designed the self-tuning adaptive switching and coupling Fiber Bragg grating (FBG) sensing systems. First, based on the characteristics of the fiber grating wavelength side of the coupling characteristics of the design and multi-function devices and adaptive coupling point based on characteristic wavelength cross-established long - short cycle switching algorithm, and then consider the impact of the characteristics of the wavelength of the operating voltage and the coupling cycle design FBG sensor and tuning algorithm supports self-tuning capabilities. Finally, the FBG sensing system coupled with an adaptive multi-switching and self-tuning capabilities. Experiments show that in terms of detection accuracy, anti-interference ability and adaptability, etc., the proposed scheme showed a clear advantage. 