Abstract:The composite seawall with a combination of steep walls and slopes is more common in the seawall projects along the southeast coast of China. Taking a composite seawall upgrading project in Guangdong Province as an example, the schemes of upgraded section seawall type, revetment structure and wave wall reinforcement are compared and selected so as to demonstrate the rationality of upgraded section from the perspective of improving the functions of engineering disaster prevention and mitigation, and the integrated economic applicability and aesthetics.