To　explore　the　mechanical　properties　of　integral　abutment-RC　pile-soil　structure,　we　designed　and　prefabricated　four　integral　abutment-RC　pile　models　with　different　pile　foundation　reinforcement　ratios　and　cross-section　shapes　taking　an　integral　abutment　bridge　in　China　as　background.　The　quasi-static　test　of　integral　abutment-RC　pile-soil　interaction　under　low　cyclic　loading　was　carried　out.　The　effects　of　reinforcement　ratio　and　cross-section　shape　of　RC　pile　on　the　mechanical　properties　of　abutment-RC　pile-soil　system　were　mainly　studied,　and　the　soil　resistance　behind　abutment,　the　soil　resistance　beside　pile,　and　the　distribution　of　pile　strain　and　bending　moment　were　analyzed.　Results　show　that　under　the　action　of　cyclic　displacement　of　abutment,　the　distribution　of　soil　resistance　near　the　abutment　back　along　the　height　direction　changed　from　＂triangular＂　distribution　to　＂parabolic＂　distribution,　and　that　away　from　the　back　of　the　abutment　was　basically　in　＂triangular＂　distribution.　The　resistance　of　soil　behind　abutment　was　affected　by　the　reinforcement　ratio　and　section　shape　of　RC　pile,　so　it　is　necessary　to　increase　the　reinforcement　ratio　of　RC　pile　or　use　rectangular　section　to　improve　the　integrity　of　integral　abutment-RC　pile-soil　system.　The　cumulative　deformation　of　pile　affected　the　distribution　of　soil　resistance　on　the　sides　of　pile,　which　reduced　the　soil　resistance　behind　pile　and　increased　the　soil　resistance　in　front　of　pile.　The　specimens　with　larger　reinforcement　ratio　or　rectangular　cross-sectional　RC　piles　were　less　affected　by　the　cumulative　deformation,　and　the　integrity　of　abutment-pile　foundation-soil　structure　was　better.　When　the　integral　abutment-RC　pile　structure　moved　to　the　river　span　side,　the　distribution　of　pile　strain　and　bending　moment　was　consistent　with　that　of　traditional　pile　foundation.　When　moving　to　the　riverbank,　the　maximum　strain　and　bending　moment　of　pile　appeared　at　the　joint　between　the　bottom　of　abutment　and　the　top　of　pile.　Increasing　the　reinforcement　ratio　of　RC　pile　or　adopting　rectangular　cross-sectional　RC　pile　can　effectively　reduce　the　strain　and　bending　moment　of　pile　body　and　improve　the　mechanical　performance　of　RC　pile　foundation.　©　2023　Harbin　Institute　of　Technology.　All　rights　reserved.