In this study, in order to develop composition ceramics for Acoustic Emission (abbreviated as AE) sensor application, the PZT system ceramics was fabricated by conventional solid state reaction method. When x=0.48, the density, electromechanical coupling factor(kp), piezoelectric coefficient d₃₃ and piezoelectric voltage constant g₃₃ of the maximum values of 7.857 g/cm₃, 0.51, 190[pC/N], 52[10-₃mV/N] were obtained, respectively, suitable for AE sensor.