To solve the problem that submerged breakwaters are highly likely to cause grounding and collision，this paper takes a breakwater project in Tianjin Port as the research object and optimizes the preliminary design of a revetment structure of single-layer accropode blocks into one of double-layer accropode blocks. By comparing the use functions，construction complexity，stability，and cost of different forms of armor structures of double-layer accropode blocks，this paper analyzes the feasibility of the proposed scheme and puts forward corresponding solutions to the actual problems encountered in the construction. The results show that the double-layer accropode blocks can solve the problems of grounding and collision and meet the requirements of the overall stability of the armor structure of the breakwater.