For the stability of the vertical revetment constructed on sand foundation,an island filling project in Haikou city is elected to research the application of compaction sand piles in the vertical revetment foundation anti-liquefaction.The calculations on the foundation liquefaction index indicate that it is necessary and feasible to pile compaction sand piles when constructing vertical revetment on sand foundation,and that compaction sand piles can increase the density of sand and eliminate sand liquefaction.Meanwhile,the results of field tests also prove that the sand foundation processed with compaction sand piles meets the anti-liquefaction requirements,and can guarantee the stability of the vertical revetment.