Abstract:In order to investigate the dynamic compaction effects under 2 different backfills of hill-skill soil and fine sand in soft ground, the field comparative tests were made in the same littoral area. The results of standard penetration test (SPT) before and after dynamic compaction and the shallow plate loading test were analyzed; and the comparative tests were also conducted. Based on the conclusion, the suggestions are put forward to further improve the foundation treatment effects after dynamic compaction.