The fine silt foundation was treated with vibroflotation without additional backfill materials in coal terminal phase II (recent hydraulic fill area) of Caofeidian port area, Tangshan Port, the ground liquefaction was eliminated, the bearing capacity was improved and long-term foundation deformation was decreased. Before the large-scale construction, the tests were made in different pile spacing （2.2 and 2.5 m）, the detection was made by standard penetration method and the bearing capacity of foundation and liquefaction removing situation were analyzed to provide the reference data for large-scale construction.