Abstract: For conventional high-frequency thickness vibration transducers,the strong presence of high-order radial coupled vibration at high frequencies leads to the problems of disordered transducer impedance curve,poor phase co-herence and low electro-acoustic efficiency.A transducer with a single thickness vibration mode is developed.The ceramic of the conventional thickness vibration transducer is cut into close-packed rectangular particles through a special process,and then all joints are filled with epoxy resin.Two pieces of 55mm diameter quasi 1-3 composite material are produced,with the transducer resonant frequency achieved to 293 kHz,resonant impedance 50Ω,-3dB impedance bandwidth of 23.5 kHz,-3dB open angle of 5.75 °,and output source level of 217.5dB for 50 watts of electric power.This process may eliminate the high-order radial coupled vibration of the high frequency thickness vibration transducer,and advance the electric-acoustic conversion efficiency and consistency.Batch manufacturing can be realized,which provides a new device for underwater acoustic applications.