Based on the design requirements for drainage and liquefaction mitigation of stone column，the soil densification between columns and the diameter at any depth should meet the design index requirements after construction. In order to verify constructionability of different equipment on coral reef sand strata and obtain suitable process control parameters and quality control procedures，the field trial test has been performed to compare the pile quality of the vibro-flotation process and the vibrating tube process，and to analyze the difference of soil compaction effect between the piles. The results show that：1）On coral reef sand strata，there is little difference in the compaction effect between the vibro-flotation process and the vibrating tube process. 2）To ensure the compaction effect of soil between piles and the quality of piles，the vibro-flotation process should be controlled by three indicators：the amount of segmented filler，the reverse -insertion compaction current and the real-time pile diameter chart.3）The vibrating tube process should be controlled by the amount of segmented filler，and the relatively loose layer should be identified in combination with the hole-making compaction current. Measures such as increasing the vibration retention time，increasing the reverse-insertion depth and slowing down the reverse-insertion speed are taken when the loose layer is formed into piles.