Design of Breasting Dolphin in dolphin type sea berths (deep water Terminal) for VLCC is ship's berthing impact force. As the size of VLCC is about several times of conventional vessels, it is important to study on ship's berthing impact force.
　Factors such as ship's virtual mass at berthing, approaching velocity and eccentricity coefficient are to be cleared in order to calculate ship's effective bert hing energy precisely.
　In this paper, the results of a field investigation, a model test and some theoretical consideration are presented. And the calculation method of berthing impact force of VLCC is proposed.