| The caisson breakwater is a construction usually used in the port and offshore engineering works, which is sometimes destroyed under the force of breaking wave. In this paper, the dynamic finite element model of the caisson breakwater will be founded within the environment of the widely used software ANSYS, and the numerical method of the dynamical response of caisson breakwater will be studied. The main content included in the paper is as follows:1 The finite element dynamic model is founded in this paper using the giant popular finite element software ANSYS. The calculating method of the dynamical response of the caisson breakwater is researched.2 The contact surface is placed between the caisson and the bedding ,the state of sliding,opening,closing between the two parts is modeled well. The dynamical response result of the sliding distance and the rock angle of the caisson breakwater is acquired. So the effectivity of the finite element method is proved.3 The comparison between several simple models of the caisson breakwater is done. A dynamic analysis model with a mass-damper-spring system is used, the numerical analysis method of caisson breakwater under the breaking force is studied.4 Many kinds of theories and methods that have been used to compute the dynamic parameters of breakwaters are summarized and studied here. A new calculation method for the spring constants of foundation and the damping coefficients of foundation is presented.
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