Abstract: A construction method of soil improvement is introduced by compaction and replacement of stone ballast columns and reinforced earth on the ore dock of 200000t Beilungang Harbour in Ninbo. Field measurement is conducted by the most disadvantageous composition of working loads. The strengthened foundation is gained in the bearing capacity under the field loading test. The development of stress and strain of the foundation soil and the impact on the foundation of the bucket carrier are obtained in the loading period.