control to change the direction of ship for minimizing a long period mooring force. Distributions of stresses and pore water pressure in seabed around anchors are investigated by analyzing a frequency response of cnd bearing anchor due to ship motion. Considering the interaction between anchor and seabed, the feasibility of a double point mooring system are examined, and the effects of both, the stiffness and the mass ratio of anchor plate on the response of anchor plate are numerically investigated.