The paper introduced a large newly built engineering site, which was formed by filling sand for sea reclamation in the recent. The investigation exposed that there were earthquake liquefaction and low bearing capacity in the upper formation, high-energy compaction was planed for treatment; and the safe distance should be determined to avoid the vibration influence to the existed permanent breakwater by testing. The vibration attenuation test was adopted to have dynamic compaction vibration test to support the late large-scale compaction construction. The vibration attenuation test and the test result analysis were illustrated with the engineering case.