Fiber Bragg Grating Sensor Demodulation System for wavelength calibration technology is the focus of attention, usually FBG sensor with fixed wavelength is fixed in a constant temperature box, as a fiber Bragg grating sensor demodulation system's reference components. This method takes up a broadband light source wavelength range, thereby constraining the scope of the wavelength scanning of the demodulation system. The fiber Bragg grating sensor demodulation system was built, which can change the filter driver Saw FP signal into a square wave signal as a reference signal needed for synchronization processing, eliminating the need for the fixed-wavelength FBG sensors, fully using the broadband light source wavelength range, and making the demodulation technique to become simple, while increasing the number of external FBG sensors.