This paper discusses the design of a vertical double cylindrical caisson structure that combines both operation and prevention functions.It proposes the elevation design standards during ship operations that the average overtopping is less than 0.1 L/(s·m) and the overtopping is less than 50 L/(s·m) during storms (once in a hundred years).The paper studies two kinds of connection modes of double cylinders using concrete thin plates and thick plates,and introduced their stress characteristics,calculation models,and internal forces.It summarizes the recommended calculation methods for the design of vertical embankment bottom protection,and it is found that the CEM chart method result is consistent with the 3D physical model test,the OCDI method has a larger calculation result,and the national standard mapping method has a smaller calculation of block stability weight.Furthermore,it studies the structural scheme of setting the sea side wave wall in the middle of a circular caisson with a reverse arc angle,and proposes that the EurOtop method has wide applicability and the results are close to the experimental values.Then,a method for protecting the embankment head is proposed by sealing the filling between the caissons with prefabricated I-blocks and connecting the four caissons at the embankment head with thick plates as a whole.The feasibility of the structural scheme has been verified through conducting 2D and 3D model experiments.The research results can provide reference for similar designs.