The effect of Sn:Ti variations on antiferroelectric to ferroelectric phase transition of (Pb 0.97 La 0.02 )(Zr 0.65 Sn 0.35−x Ti x )O 3 (x=0.08–0.11) ceramics with compositions near antiferroelectric to ferroelectric morphotropic phase boundary was studied. X-ray diffraction showed that all samples were tetragonal phase at room temperature. With the increase of x from 0.08 to 0.1, all samples showed the typical antiferroelectric double loops. The critical value E AF of the electric-field induced antiferroelectric to ferroelectric phase transition decreased from 64kV/cm to 38kV/cm, and the electric field E FA of induced-ferroelectric to antiferroelectric phase transition decreased from 44kV/cm to 10kV/cm. A high polarization of the sample with x=0.1 can be induced with a lower electric filed. The variations of Sn:Ti ratio had no effect on hysteresis of ΔE (=E AF −E FA ), but ΔE reduced with temperature increasing. The virgin sample of which x=0.11 was intrinsic antiferroelectric phase, but the remanent polarization of induced-ferroelectric phase remained after electric-field was removed at room temperature.