The effects of NiO-doping on the microstructure and piezoelectric properties of PMSZT ceramics were investigated. The experimental results indicate that pure perovskite structure was obtained in the doping range. With the increasing of doping amounts, phases shift from tetragonal phase to rhombohedral phase. The mechanical quality factor (Qm) , Dielectric constant (εr) , electromechanical coupling factor (Kp) and piezoelectric constant (d33) increase with the increasing of doping amounts and then decrease, whereas, dielectric loss (tanδ) decrease and then increase. The ceramics with doping amount of 0.1wt.% sintered at 980 °C have the optim properties of Qm=1345, εr=1853, Kp=0.62, d33=375 and tanδ=0.21%。