To improve the large strain of piezoelectric ceramics used for the laser frequency stabilizer in laser gyro,the composition of piezoelectric ceramics was designed and synthesized by the conventional solidstate reaction method.The excellent piezoelectric and dielectric properties were obtained at r(Zr)/r(Ti)=46/54 sintered at 1 180 ℃ for 3 h:d33≈640 pC/N,cE11=60.61 GPa,εT33/ε0≈3 300,tan δ≈1.85%,kp=0.655,TC=272 ℃.XRD analysis indicated that the morphotropic phase boundary composition was r(Zr)/r(Ti)=46/54.SEM showed that the sintering temperature had significantly influence for the ceramic grain size with rapid increase of grain size at 1 180~1 200 ℃.