The　classical　Poulos＇s　elastic　theory　is　only　suitable　for　the　behavior　analysis　of　piles　subjected　to　lateral　soil　movement　in　homogenous　soil.　But　it　cannot　take　the　layered　soil　into　account.　Therefore,　to　satisfy　the　characteristics　of　layer　soil,　Poulos＇s　method　is　modified　by　using　the　Mindin＇s　solution　considering　a　horizontal　concentrated　force,　and　also　considering　the　stress　and　displacement　solution　under　the　ground　vertical　load　in　sandwich　ground,　which　can　be　used　to　study　the　movement　and　internal　force　response　of　passive　pile　due　to　surcharge　loading.　A　calculation　case　indicates　that　the　modified　method　is　more　strict　and　reasonable　than　that　of　Poulos,　with　a　higher　calculation　precision.　The　approach　proposed　can　be　used　extensively.