A fiber Bragg grating (FBG) acceleration vibration sensor based on the double un iform strength cantilever beams is developed.First,the simulation is conducted b y ANSYS software.We can obtain the sensor amplitude-frequency and phase-frequency characteristics in each dam ping ratio.Through changing the parameters of the sensor structure,we can get sensor optimal struct ure parameters that can make the sensor with the best resonance frequency and acceleration sensitivity.Seco nd,the sensor is fabricated based on the optimal structure parameters.Finally,the sensor is studied by the shaking table test.The experimental results show that the resonant frequency of the developed vibration sensor is 80.74Hz,and the acclelration sensitivity is about 20.85pm/m·s－2.Amplitude-frequency characteristics of the sensor in the 5-50Hz frequency range show a flat horizontal line.The proposed sensor is suitable for the low-frequency (5-50Hz ) vibration signal detection.