Abstract: With PbZr_0.49Ti_0.51O₃ (PZT) piezoelectric ceramic powder before and after ultrasonic cleaning and polyvinylidene fluoride (PVDF) as raw materials, 0-3 type PZT/PVDF piezoelectric composites containing different content of ceramic powder were prepared by flow casting method. The effects of ceramic powder content and surface-attaching microparticles on the properties of the piezoelectric composite were studied. The results show that the surface of the ceramic particles was attached with ceramic microparticles without ultrasonic cleaning, and the ceramic microparticles were almost removed after ultrasonic cleaning. The relative dielectric constant and piezoelectric constant of the piezoelectric composites increased with the increase of ceramic powder content. The relative dielectric constant and piezoelectric constant of the piezoelectric composite obtained with ceramic particles without surface-attaching microparticles were higher than those with surface-attaching microparticles; the difference values of the relative dielectric constants and of the piezoelectric constants increased with the increase of ceramic powder content.