A medium and high frequency fiber Bragg grating (FBG) acceleration dete ctor based on lever amplification is proposed.The acceleration sensitivity and amplitude-freq uency characteristics of the detector are theoretically analyzed and experimentally studied.The exper imental results show that the change of central wavelength of the detector has a good linear relation ship with the change of external acceleration.The natural frequency of the detector is 612 Hz and the fl at area range is 20—250 Hz.The linearity is 0.995,the acceleration sensitivity is 106.7 pm/g,an d the cross sensitivity is less than 4.9%.It has good anti-interference ability.