In order to identify the structural damage with phase-shifted fiber g rating (PS-FBG) instead of piezoelectric ceramics (PZT),we studied the frequency response characteristics of PS-FBG ultrasonic signals in the range of 100kHz—1.5MHz ultrasonic signals.We built an ultrasonic excitati on signal generation platform and a fiber grating balance sensing system with high sensitivity to detect the respo nse signals excited by continuous ultrasonic,which are analyzed by amplitude analysis method.Due to the resonanc e frequency of the thin plate,a burst excitation signal with a time length of 0.5ms was used,and the response o f the sensor is evaluated by an energy analysis method.The experimental results demonstrated that the frequency response of the PS-FBG sensor is in the range of ±3.49dB,and the PS-FBG sensor has a wide-spectrum respon se to the ultrasonic signals in the range of 100kHz—1.5MHz.