In order to avoid the defect in traditional analytic method and the finite element analysis (FEA)used in the analysis of piezoelectric ceramics, FEA software ANSYS was introduced to analyze the characteristics of lanthanum-modified lead zirconate titanate (PLZT) ceramics. The software ANSYS and its coupled-field analysis function were introduced. The ANSYS model of PLZT was built and based on the model the static and dynamic performances of unilateralism, multilayer and bimorph PLZT were analyzed. The displacement output of unilateralism was linear with applied voltage and force load. The displacement output of multilayer was less than the theoretical output because of the deformation of the adhesive layer between each two layers of PLZT. The deformable magnitude of bimorph calculated with ANSYS was very close to the theoretical results by comparing with each other. So ANSYS software can be used to build solid models, employ geometrical dimensions and material characteristic parameters at piezoelectric devices analyses. Aiming at different devices, it just needs modify parameters, and the program has good currency.