Abstract: High-frequency wideband omnidirectional transducer is the development direction of the research of underwater acoustic transducer,PZT piezoelectric composite ring is not only capable of horizontal omnidirectional transmitting and receiving underwater acoustic signal. Meanwhile,it also makes the bandwidth of the transducer is expanded. Using the ANASYS finite element simulation software,the modal simulation of the ring structure of the 2-2 type piezoelectric composite is carried out,and the relationship curve of the bandwidth and the structure size is obtained.. Based on the simulation,a design scheme is formed,cutting circular piezoelectric ceramics along the axial direction,there is epoxy resin in the groove. Thus the 2-2 type piezoelectric composite circular tube is formatted. Tested the material of piezoelectric and dielectric properties,the results show that the d33 constant of up to 480 p C/N,the vibration displacement is 89. 5pm velocity is 3200 m/s,acoustic impedance is 18. 05 Mraly,the bandwidth is 11. 2k Hz,the relative dielectric constant 859. The piezoelectric composite circular tubes suitable for horizontal omnidirectional broadband transducer.