In order to improve the berthing stability condition of continuous wharf under the influence of long period wave,combined with an engineering project,this paper analyzes the characteristics of the line tension and the movement of the ships moored by the continuous wharfs under the influence of long-period waves by using the numerical analysis software,and puts forward the key factors to improve the berthing stability under the influence of long-period waves.The results show that the mooring lines tension force and moored ships movements will increase significantly as the period of the wave increases,and the key of mooring optimization is to improve the elasticity of the mooring system so as to absorb the motion energy of the ships.The mooring optimization measures include adding the mooring line’s length,using the non-rigid mooring line or increasing the nylon tail’s length.After the mooring optimization measures being adopted,the mooring lines tension force can be reduced significantly under the influence of long period wave and the purpose of mooring layout optimization can be achieved.