The weak sandwich formed in the process of blowing sand reclamation in the coral sand foundation construction site has a poor engineering performance and leads to a low bearing capacity and large settlement of coral sand foundation.According to the research on soil property based on the physical experiment,we use four different technological parameters of vibroflotation compaction construction method.Results show that process three effects best.Therefore,arranging reasonably the vibrators and choosing coarser filler for the back-fill replacement can make the soft powder denser and improve the coral sand foundation’s bearing capacity significantly,and eventually meet the design requirements.