Aiming at a new type of movable anti-wave structure in harbor engineering,we establish four kinds of analysis models based on the finite element method.The comparison of analysis shows that the finite element model created by coupling the degrees of freedom of the nodes at the contact surface is more applicable.We apply the above-mentioned finite element model to solve the stress,displacement and bolt internal forces of the movable anti-wave structure,and analyze the influence of the variation of the steel thickness on the mechanical properties of the composite structures.The results show that the tension and compression stress of the lower end of the steel members are relatively larger,and the situation needs to be emphasized.The smaller the thickness of the steel member is,the more sensitive the stress and displacement of the composite structures have.Combining safety with economy of the anti-wave structure,it puts forward the design and optimization points,and provides reference for the engineering application.