The relaxor ferroelectric ceramics, (1-x)Pb(Sc_ 0.5 Ta_ 0.5 )O_3-xPb(Zr_ 0.52 Ti_ 0.48 )O_3 (abbr. PSTZT), were prepared by using the conventional oxide method and precursor method sintered at 1200℃ to 1350℃. The experimental results showed that high percent (almost 100%) of the perovskite structure of PSTZT ceramics were obtained for all the doped samples. The SEM observation showed that the crystalline grains of the PSTZT ceramics were well-stacked and the grain boundaries were well clear. From the analys...