Large　slip　often　occurs　in　deep　soft　soil　during　large　area　filling　or　excavation,　which　brings　great　difficulty　to　the　analysis　of　anti-sliding　pile　considering　pile-soil　interaction.　For　this　purpose,　a　modified　cantilever　pile　method　was　proposed　to　overcome　the　problem　in　the　calculation　of　the　existing　cantilever　pile　method　considering　the　sliding　behavior　of　deep　soft　soil　layer.　The　soil　pressure　of　the　pile　passive　loading　segment　adopts　an　isosceles　triangle　distribution,　and　the　maximum　value　is　identical　to　the　ultimate　lateral　soil　pressure.　The　soft　soil　around　the　pile　anchorage　segment　is　assumed　as　ideal　elastic-plastic　to　consider　the　large　displacement　of　the　soft　soil.　In　addition,　the　displacement　superposition　principle　is　applied　to　deal　with　the　discontinuous　displacements　around　the　sliding　surface　existed　in　previous　methods.　The　displacement　and　bending　moment　results　obtained　by　the　proposed　method　are　verified　by　in-situ　pile　side　loading　test.　The　displacement　error　of　pile　top　is　less　than　3%,　the　maximum　bending　moment　error　of　pile　is　less　than　10%.　The　proposed　method　is　helpful　for　the　design　and　calculation　of　anti-sliding　piles　in　deep　soft　soil　layer.　©　2022,　Editorial　Office　of　Rock　and　Soil　Mechanics.　All　right　reserved.