In view of such problems as narrow space inside the caisson cell of gravity wharf,difficulty in drainage,difficulty in strengthening the internal packing compactness,and difficulty in ensuring the integrity of the side wall and bottom of the caisson,the static contact test results of four caisson compartments with different vibroflotation parameters were compared and analyzed.The three vibroflot parameters(vibroflot number,compacted current and retained vibration time)affecting the reinforcement effect were optimized,and the optimal working conditions of single point vibroflot,compacted current 80 A and retained vibration time 20 s were finally determined.This working condition can reduce the influence of vibroflot on the caisson and save the construction cost while ensuring the compactness of the packing.It is also found that there is a conic curve correlation between the vibro-compaction current in the caisson and the average cone resistance at the corresponding position.