Taking a wharf reconstruction project in Hunan province for example,we introduce key design points of the flexible breasting clustered piles with large fluctuation.Based on the NL method,we get the variation law of the pile’s elastic factor,and analyze the horizontal force and energy distribution between piles and fender by considering the displacement compatibility and static balance.We also calculate the stress and deformation of the pile cluster,and verify the design of fender piles cluster.The results show that we should choose the fitted fender in different sections of the flexible anti-collision pile cluster,which gives play to energy-absorbing advantages of the fender.