For thin structures immersed in water,a fully interaction between the structural domain and fluid domain needs to be taken into account.The finite element method(FEM)was used to model the structure parts of the problem due to its high flexibility and applicability to large-scale practical models,while the boundary element method(BEM)was used to model the sound field to avoid the need to mesh the fluid domain.So,a suitable approach for the analysis of fluid-structure interaction problems is the coupling FE/BE method [1,2].The approach of continuous linear and quadratic boundary elements is often applied,the alternative of discontinuous elements with higher accuracy was investigated in [3].