ABSTRACT In the study, in order to develop low-temperature-sintering ceramics for multilayer piezoelectric transformer, (Pb0.76Ca0.24 −xSrx)Ti0.96 (Mn1/3Sb2/3)0.04O3 ceramics were fabricated using Na2CO3 and Li2CO3 as sintering aids and their dielectric and piezoelectric properties were investigated with amount of Sr substitution. The modified PbTiO3 ceramics with a composition of (Pb0.76Ca0.24 − xSrx)Ti0.96 (Mn1/3Sb2/3)0.04O3; x = 0 − 0.05 were prepared by conventional mixed-oxide at sintering temperature of 880, 900 and 930°C. At the sintering temperature of 900°C, thickness vibration mode electromechanical coupling factor (Kt) and thickness vibration mode mechanical quality factor (Qmt) of composition ceramics with 1.0mol% Sr substitution showed the optimal value of 0.50 and 1575 respectively, for multilayer piezoelectric transformer application.