Ceramics plastic composite materials consisting of piezoelectric hard materials with a high QM, a high k33 and a low s33 properties for the ceramics and epoxy resin for the plastic were fabricated. Dielectric, piezoelectric and elastic properties were studied for the thickness ex-pansion of composite materials. Piezoelectric composite materials with the properties of about 1/3 times lower densities (2.61 g/cm³), about 1/10 times lower relative dielectric constant(130), about 10 times higher elastic compliance constant (138.6×10^-12m²/N) and 4.4 times higher piezoelectric voltage constant (101×10^-3V⋅m/N) than the usual ceramics were obtained.