| yPb(Mn1/3Sb2/3)O3-(1-y)PbZrxTi1-xO3+zwt%SiO2 (PMS-PZT) ternary piezoelectric ceramics with x=0.485～0.515, y=0.03～0.09 and z=0.05～0.30 were prepared by conventional solid solution method. The samples were gained by adding SiO2 in order to decrease the sintering temperature and improve the dielectric and piezoelectric properties. The X-ray diffraction (XRD) and the scanning electronic microscope (SEM) were applied to analyze phases and microstructure respectively. The effects of Zr/Ti ratio, content of PMS and SiO2 near the morphotropic phase boundary (MPB) of the system on the phases, microstructure and dielectric and piezoelectric properties were also discussed.The study on the properties of the system PMS-PZT with different Zr/Ti ratio and PMS content indicates that the MPB of the tetragonal and rhombohedral phase lie in a broad composition region. Increasing Zr/Ti ratio and PMS content shifts compositions away from the tetragonal phase across the MPB toward the rhombohedral phase and reduces the Curie temperature. The sintering temperature can be lowed and high dielectric and piezoelectric properties can be obtained with proper addition of SiO2. The optimum properties can be obtained with x=0.495, y=0.05 and addition of 0.10wt% SiO2 at sintering temperature of 1100℃with 2 hours. The main parameters:ε3T3ε0=1290, tanδ=0.4%, d33=265pC/N, Kp=0.59, Qm=3110, Tc=320℃.The influence of technical parameters on properties of piezoelectric ceramics 0.05Pb(Mn1/3Sb2/3)O3-0.95PbZr0.495Ti0.505O3+0.10wt%SiO2 were also discussed. The influence of sintering temperature on the properties of this system is more than sintering time, and optimum properties can be obtained with broad sintering temperature 1100℃～1150℃and sintering time 2 hours respectively. The optimum polarizing electric field, polarizing temperature and polarizing time is as follows: 3.5kV/mm, 120℃, 30min.
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