The piezoelectric material is the key of preparing the energy harvesting device with high performance as a kind of core functional material for environmental vibration energy harvesting device.The 0.7Pb(Zr0.51Ti0.49)0.99O3-0.3Pb(Zn1/3Nb2/3)O3(PZT PZN)piezoelectric ceramic were prepared by the two step synthetic method. The effect of different doped mass contents of La2O3 on the crystallographic phase and electromechanical properties have been studied. The results showed that the piezoelectric coefficient d33,the electromechanical coupling factor (k31,kp) and the dielectric constantεr have been improved with little La2O3 dopants.The PZT PZN ceramic sintered with 4% La2O3 doping possesses the optimum propeties of d33=560 pC/N,k31=0.376,kp=0.642,sE11=16.5×10-12m2/N,εr=3 125.