A　3D　finite　element　model　of　integral　abutment　steel　bridge　was　established　by　the　SAP2000　software,　the　nonlinear　spring　elements　and　damping　elements　were　used　to　simulate　the　soil　reactions　behind　the　abutment　and　around　the　piles　under　the　earthquake　action,　and　the　mode,　nonlinear　time　history　and　relevant　parameters　of　the　bridge　were　analyzed,　In　addition,　the　dynamic　and　seismic　behaviors　of　integral　abutment　steel　bridge　considering　the　nonlinear　soil-structure　interaction,　as　well　as　the　influence　of　the　main　design　parameters　of　integrated　abutment　system　on　the　behaviors　were　studied.　Research　result　indicates　that　compacting　the　abutment　backfill,　increasing　the　abutment　height-to-thickness　ratio,　and　increasing　the　foundation　stiffness　will　increase　the　dominant　longitudinal　frequency　of　the　bridge　structure　by　about　6.5%-16.0%,　while　H　pile　orientation　has　a　minimal　influence　of　about　1.6%.　The　structural　seismic　response　significantly　reduces　as　the　abutment　height-thickness　ratio　increases.　When　the　abutment　height-to-thickness　ratio　is　1.44,　the　top　of　the　pile　enters　the　plastic　stage.　When　the　height-to-thickness　ratio　increases　to　3.15　and　3.85,　the　pile　remains　elastic.　When　the　compactness　of　the　abutment　backfill　decreases,　the　seismic　response　of　the　structure　increases　significantly,　and　the　increment　is　mostly　above　40%.　When　the　orientation　of　the　pile　is　adjusted　from　bending　about　the　strong　axis　to　bending　about　the　weak　axis,　the　maximum　bending　moment　of　the　pile　decreases,　but　the　bending　stress　increases,　and　the　material　enters　the　plastic　stage　from　the　elastic　stage.　As　the　soil　stiffness　around　the　pile　increases,　the　displacement　response　of　the　bridge　decreases　significantly.　The　maximum　displacements　at　the　top　of　the　pile　and　abutment,　as　well　as　the　bending　moment　at　the　pier　bottom　decrease　by　about　50%.　However,　the　bending　moment　at　the　pile　top　increases　by　more　than　40%,　and　the　orientation　of　the　pile　has　almost　no　effect　on　the　displacement　responses.　As　long　as　the　design　requirements　are　satisfied　and　in　a　reasonable　range,　the　larger　height-to-thickness　ratio,　more　flexible　abutment,　and　compacted　abutment　backfilling　are　recommended　to　reduce　the　seismic　response　of　integral　abutment　bridge.　When　the　steel　H　pile　is　used　as　the　abutment　foundation,　orienting　the　H　pile　to　bend　about　its　strong　axis　is　recommended　to　reduce　the　maximum　bending　stresses　and　displacements　of　the　pile,　abutment　and　pier.　8　tabs,　8　figs,　31　refs.　©　2018,　Editorial　Department　of　Journal　of　Traffic　and　Transportation　Engineering.　All　right　reserved.