Abstract: The polarization direction 011, zxt-45° cut PIN-PMT-PT single crystal has a broad application prospect in underwater acoustic transducer due to its high shear piezoelectric strain constant, high electromechanical coupling coefficient and high compliance coefficient. By using an intermediate mass block, the shear vibration generated by the single crystal is converted into the longitudinal vibration of the transducer, and the bandwidth is broadened by the coupling between the bending vibration of the circular piston and the vibration of the ring tail mass block. Through the finite element simulation analysis, the influence of the structural parameters on the vibration modes and resonance frequency is studied. Finally a virtual prototype is determined. The maximum transmitting voltage response is 138 dB with the fluctuation less than 4 dB in the frequency range from 6 kHz to 18 kHz. These results show that the use of the face shear mode is beneficial to achieving low frequency and broadband radiation performance of the transducer with compact size.