In response to the issue of evaluating the stability of hydrodynamic response of perforated chamfered caisson breakwaters under design conditions,this paper establishes a scaled model of the perforated chamfered caisson breakwater in a flume based on physical model test.The structural stability,overtopping,and wave pressure distribution under wave conditions corresponding to different water levels are carried out in the model test,and the structural design is improved and optimized based on the test results.The research results indicate that the original structural scheme has a significant movement of the bottom protection block under wave conditions corresponding to extreme high water level and design high water level,and the amount of structural overtopping is too large.Under the wave conditions corresponding to the design low water level,the caisson structure experiences significant cumulative displacement.Therefore,the structural design needs to be optimized.Raising the top elevation of the breast wall can effectively reduce the overtopping of the breakwater.When the optimized top elevation is raised to 15 m,it can meet the requirements of design standards.The maximum position of the wave pressure distribution on the wave facing surface of the breakwater is positively correlated with the water level,and the maximum buoyancy pressure appears at the outer bottom of the caisson,which gradually decreasing towards the tail.The model test fully demonstrates the feasibility of the design scheme for the breakwater structure,providing reference basis for structural optimization.