The surface layer of an ore wharf yard is composed of loose silty fine sand by recently reclamation,and the underground water level and mud content are relatively high.In order to verify the feasibility of foundation treatment by dynamic compaction method and optimize the construction parameters,we set two testing areas with treatment thicknesses of 6 m and 9 m,carry out 2,000 kN·m and 4,000 kN·m energies of dynamic compaction in test areas,and at the same time monitor pore water pressure and dynamic compaction settlement in the construction process.After the completion of the treatment,we carry out SPT and load test,and give the formula of the hyperbolic relationship between dynamic compaction energy and tamping volume.The results show that the dissipation period of pore water pressure is about two days,and the optimal number of each dynamic compaction point is seven to eight.The bearing capacity of the foundation is significantly improved,reaching the design bearing capacity of 200 kPa after the dynamic compaction.