Abstract: 1-3 piezoelectric composites were fabricated by using cut-filling method that PZT-5A wasused as piezoelectric phase and modified 618epoxy resin wasused as polymer phase.The dependence of mechanical quality fa ctor,Q_m,of 1-3piezoelectric composites on the volume fractions and dimensions of piezoelectric phase were investigated.The optimized 1-3piezoelectric composite material is of lower mechanical quality factor,with a Q_m of 10measured at 850kHz and with a width of resonance frequency,WB,of 86kHz.