The paper analyses the method statements of the soil improvement in the reclamation area by the cutter suction dredger. According to the sand analysis, CPT and preliminary dynamic compaction, the combination method of vibro-flotation and dynamic compaction are carried out for different reclamation areas. CPT and in-situ density test are used to verify the densities of the structural fill and the degree of compaction for the first metre thick fill layer respectively after ground treatment. After ground treatment, not only the bearing capacity of the proposed structural fill is increased, but also ground settlement on these locations is limited. The successful implementation of this project provides instructive reference and valuable experience for similar engineering cases.