The effects of Pb content on crystallographic phase, microstructure, electric-properties of PMSZT piezoelectric ceramics were studied. The crystallographic phase and microstructure of the ceramics were examined by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental result shows that the samples consist of a mixture of tetragonal and rhombohedral phases in the range of lead contents x=0.95-1.06, grains grow up homogeneously and the minimum value of Curie temperature was obtained with x=1.02. With Pb content x＜1.02 or x＞1.02, the Curie temperature moves towards a high temperature. A well-situated electric-properties of εT33/ε0(1660),d33(344pC/N), Kp (0.684), Qm(2350),tan δ(0.0030) were obtained when lead content x=1.02.