xPb(Mn1/3Nb2/3)O-3-(0.2-x)Pb(Zn1/3Nb2/3)O-3-0.8Pb(Zr0.52Ti0.48)O-3　(x=0-0.20)　quaternary　fine　ceramics　(PZMN-PZT)　were　prepared　by　the　columbite　two-step　process　and　the　effects　of　composition　on　the　microstructure　and　piezoelectric　properties　were　investigated.　The　results　revealed　that　the　ceramics　were　sintered　densified　in　the　range　1　250degreesC　to　1300degreesC,　and　the　lattice　structure　of　the　system　was　transformed　from　the　tetragonal　to　the　pseudocubic　with　the　increasing　of　Pb(Mn1/3Nb2/3)O-3　content.　The　optimized　results　that　is,　Q(m)=2528,　k(p)=0.55,　tandelta=0.003,　epsilon(33)(T)/epsilon(0)=　1150,　T-c=325degreesC,　were　obtained　at　x=0.1,　which　can　be　used　as　high　power　piezoelectric　transformer　materials.