The　integral　abutment　jointless　bridge　(IAJB)　has　advantages　such　as　long　service　life,　convenient　construction,　lower　cost　of　building,　and　maintenance.　Currently,　it　is　widely　used　globally.　A　test　model　of　an　integral　abutment-pile　foundation　structure　was　designed　and　manufactured　based　on　a　practical　IAJB.　The　pseudo-static　test　under　low-cycle　reciprocating　displacement　load　was　conducted　to　study　the　interactions　between　the　integral　abutment-H-shaped　steel　pile　and　soil.　Then,　the　strain,　bending　moment　as　well　as　shear　force　of　the　abutment　and　the　pile　foundation　were　mainly　studied.　The　experimental　results　show　that　the　strain　distribution　of　the　pile　body　is　in　the　shape　of　a　cup　when　the　abutment　moves　to　backfill　positively,　while　it　is　in　the　shape　of　an　olive　when　the　abutment　moves　negatively.　Moreover,　the　maximum　compressive　stress　and　tensile　stress　under　the　positive　displacement　load　are　greater　than　those　under　the　negative　load.　Therefore,　the　internal　force　of　the　pile　foundation,　when　the　temperature　increases,　is　greater　than　when　the　temperature　drops,　indicating　that　the　H-shaped　steel　pile　foundation　is　more　adversely　affected　when　the　temperature　rises　in　the　summer　months.　It　is　suggested　that　the　overall　bridge　closure　temperature　should　be　slightly　higher　than　the　annual　average　temperature　to　reduce　the　adverse　impact　on　the　pile　foundation　resulting　from　high　temperatures.　Additionally,　the　calculation　also　shows　that　when　the　negative　load　is　applied,　the　bending　moment　and　shear　force　of　the　pile　body　calculated　by　these　methods　deviate　marginally　from　the　test　results,　and　the　distribution　law　is　similar　to　that　of　the　traditional　pile　foundation.　However,　in　the　case　of　positive　loading,　the　pile　bending　moment　and　shear　force　calculated,　using　these　theories　behind　the　abutment　or　the　bridge　specification,　deviate　considerably　from　the　test　results,　and　the　distribution　law　is　different　from　that　of　the　traditional　pile　foundation.　In　this　paper,　the　method　of　polynomial　fitting　and　Huang-　Lin　can　be　more　accurately　calculated　the　integral　abutment　pile-soil　interaction　of　bending　moment　and　shear　force.　This　method　can　be　used　in　practical　engineering　to　calculate　the　internal　force　of　the　abutment　and　the　pile　of　the　integral　bridge　and　form　a　frame　of　reference　for　the　design　and　application　of　integral　bridges　in　the　future.　©　2021,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.