In the purpose of this research, it is provide a design method for the hydraulic model of the wave energy converter, modular design can reduce the maintained number, and increase the useful life of the wave energy converter and reduced cost. In irregular wave, the stroke of the reciprocating pump must have a protected instrument. Wavelength, wave amplitude and wave velocity can make an effect to obtain the wave energy. In a dynamic analysis of the wave energy converter, it would explain the effect from the mass, damping, equivalent stiffness and wave frequency.