Stabilizing　piles　is　a　typical　passive　reinforcement　measure　that　is　widely　used　in　slope　and　foundation　excavation.　In　slope　stability　analysis,　the　force　of　a　stabilizing　pile　is　often　taken　as　the　fixed　value.　Obviously,　this　approach　simplifies　the　impact　of　stabilized　piles　on　the　slope.　Based　on　the　passive　effect　of　stabilizing　piles,　this　study　elaborates　on　the　sliding　mechanism　of　slopes　under　seismic　conditions.　To　establish　the　relationship　between　the　slope　displacement　and　the　force　of　the　pile,　a　new　method　of　equivalent　displacement　is　proposed.　The　Newmark　method　and　limit　analysis　are　used　to　derive　the　formulas　of　slope　displacement　and　safety　factor.　Through　typical　cases,　different　stabilizing　pile　models　and　the　cumulative　effect　of　multiple　seismic　loads　are　analyzed.　In　addition,　the　influence　of　various　parameters　on　slope　stability　is　discussed.　The　results　show　that　(1)　the　stabilizing　pile　has　an　obvious　passivity.　The　antisliding　force　is　gradually　released　with　the　sliding　and　squeezing　of　the　slope,　showing　the　trend　of　increasing　first　and　then　stabilizing.　(2)　Under　the　condition　of　multiple　seismic　loads,　the　slope　has　a　cumulative　effect.　If　the　passive　effect　of　the　pile　is　considered,　the　calculation　result　is　more　conservative.　(3)　The　location　of　the　pile　and　the　length　of　the　anchoring　section　have　a　more　significant　influence　on　the　slope　stability.　Risk　analysis　based　on　displacement　can　be　used　in　the　design　of　reinforcement　schemes.　©　2021,　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.