The southeastern coast of Hainan Island experiences frequent typhoons，and the nearshore wave limiting heights can reach up to 10 meters，making the port construction conditions harsh.The structural safety of the breakwater becomes a key challenge for port construction in this sea area.This paper studies the stability of the sloping breakwater based on the South China Sea emergency salvage support base project，and conducts stability experiments on different types of armor blocks and bottom blocks of the breakwater using a three-dimensional wave physical model.The results indicate that the stability of the breakwater foundation directly affects the stability of the armor blocks in this strong wave areas.Increasing the mass of the bottom blocks to achieve stability is not effective，while adopting an embedded bottom protection can improve stability and minimize the mass of the bottom blocks，thereby meeting the stability requirements of the breakwater armor blocks and saving engineering investment to some extent.