Abstract:In this paper, subsea sand-silt unsolidified mixtures were prepared by mixing silt and subsea sand, and cement was added to prepare solidified mixture, in order to analyze the dynamic response of coastal levee under seismic load. Using the finite element software Geo-studio, the dynamic response of coastal levees with seismic load was studied, the results show that the stability safety factor of coastal levee filled with unsolidified mixtures cannot meet the requirements of the standard under seismic load, while the coastal levee filled with solidified mixture can reduce the acceleration amplitude, liquefaction damage range and permanent displacement of the coastal levee, and the coastal levee can satisfy the demands of stability under static and seismic load.