An open piled pier with steel piles has been widely used as a berthing facility in ports and harbors in Japan. The ductility design method has recently been introduced to make accurate assessment of structural performance of open piled piers during earthquakes. Since this verification method involves rather new ideas, a standard analytical program has to be developed and engineering information for analyzing this type of structure with this program has to be accumulated. The computer program of elasto-plastic basis has been developed by the authors and through parametric studies on the analyses, a simplified verification method has been also established. This technical note presents the theory of the verification method and evaluation of analytical results. Also the background for the simplified verification method is presented through parametric studies. A users' manual of the computer program is attached.