Ultrasonic wave scattering at interface of a cylindrical solder embedded in an aluminum block is analyzed by finite element method under plane strain. For nondestructive characterization of inclusion, the analysis of ultrasonic wave scattering at heterogeneous, anisotropic and irregular shaped inclusions is necessary. Theoretical analysis is limited for only idealized geometry and material properties, therefore only numerical analysis is applicable for inclusions of irregular shape and real material properties. As a first step, FEM analysis is applied for an aluminum block with an inclusion of cylindrical solder. Longitudinal short pulse is given over a width larger than the diameter of the cylinder on one face of the aluminum block perpendicular to the axis of the cylinder. The refracted longitudinal wave at aluminum/solder interface is focused within the solder, and this wave partially reflected at another solder/aluminum boundary. The amplitude of the reflected wave is comparable to those reflected at the aluminum/solder interface. The shear wave which have excited by mode change at the aluminum/solder interface are backscattered in the directions of +.50 degree and superposed incoming shear wave. The numerical results are close to the surface wave propagation measured by laser ultrasonic method. ©2000 American Institute of Physics.