Aiming at the problem of the sea embankment of the Third Runway Project of Shenzhen Bao’an International Airport,such as soft soil layer is deep and thick,the construction needs to meet the demands of displacement constraint over Guangzhou-Shenzhen Riverine Expressway,and the top elevation of the sea dike cannot surpass the 15 m safety limit line,we propose the low pile platform vertical structure,and utilize cement mixing pile in the ground treatment.We reasonably determine the top elevation of the sea embankment according to the empirical formula and wave physical model tests,and adopt Plaxis 3D software(internationally accepted software) in structure force analysis,which proves that this sea embankment scheme can effectively control the lateral deformation of the soil.In view of the anti-corrosion problem that the sea dike needs to be used for 100 years,we use the heavy anti-corrosion coating,sacrificial anode and concrete coating joint anti-corrosion measures in steel structure,so as to ensure the design protection period of the sea dike.