In this study, the dynamic behavior between the wave and the floating body is simulated to evaluate the performance of floating type energy converter. Smoothed particle hydrodynamics is employed to express the dynamic behavior of fluid. The wave is generated by wavemaker that is expressed by the moving boundary condition. To prevent the wave reflection from the opposite boundary, an exponential damping zone is placed over a distance of at least a wavelength. Two floating bodies with a rectangular and cylindrical shape are used to investigate effects of the differences in the shape. The vertical motion of a floating body is compared with the experimental result. To compare only the vertical motion of a floating body, the experimental apparatus is constructed. The high-speed camera is used to measure the motion of a floating body.