Abstract: This paper provides a practical analytical and numerical method on the propagation property of wave in an isotropic elastic half-plane body induced by a surface-bonded thickness-shear piezoelectric actuator under high-frequency electric loads. At first, the thickness-shear mode is studied as a piezoelectric actuator vibration mode, and the analytical solution for the propagation of elastic wave in an elastic half-plane body induced by the piezoelectric actuator can be obtained by using integration of the normal strain. Then, the responses of the solution inside the piezoelectric actuator and in the half-plane body are obtained according to the boundary conditions. The distribution characteristics of horizontal displacement along the upper surface of the elastic half-plane body are analyzed, and the effect rules of the geometric parameters, the material combination, the loading frequency upon the wastage of wave propagation are also discussed. Finally, the theoretical results accord with those from experiments very well, which can explain the reliability of numerical analyses.