The service of pile-supported wharf will be influenced by sediment deposition.In order to study the influence law of sediment deposition on piles,the following works are finished:the structures and soils are modeled by three-dimensional solid elements,contact elements are set up to consider interaction of piles and soils,the birth and death of elements are used to model the sediment deposition,and geotechnical parameters are calibrated by measured displacements.The result shows that the maximum bending moment will appear at the top of pile under additional earth pressure by sediment deposition,and the most of piles are in tension at the landside section while the worst section is at the top of piles which towards the sea.The stress condition of piles will be obviously improved and the influence of deposition will be reduced after excavating sediment.