Based on the foundation treatment practice of a large-scale engineering,we carry out a field test on the dynamic compaction of 6 000 and 10 000 kN?m energy-level respectively and test the treatment effect of the two energy-levels by multi-channel transient surface wave test and heavy dynamic penetration test before and after the dynamic compaction.The test result reveals that:the bearing capacity of foundation and engineering characteristics is improved after the dynamic compaction,and the bearing capacity of foundation and compression modulus of part depth cannot satisfy relative requirements after the dynamic compaction;the effective reinforcement depth of 6 000 and 10 000 kN?m are about 6.0 to 7.0 m and 7.0 to 8.0 m;due to the existence of mucky soil in the shallow layer,backfilling method of hollows,as well as the large spacing and small compaction energy of the 3rd time compaction point,the treatment effect of shallow layer is poor in 10 000 kN?m energy-level zone.Thus,measures shall be taken to improve the condition.