The　settlement　formula　for　pile-supported　reinforced　embankment　is　established　by　improving　the　elastic　foundation　beam　method　and　combining　the　column　unit　method.　The　traditional　Winkler　beams　is　replaced　by　the　Timoshenko　beams,　and　the　constraint　of　the　height　of　fill　can　be　neglected　because　the　lateral　friction　on　the　pile　side　is　considered　in　the　column　unit　method.　The　presented　method　is　employed　to　analyze　a　practical　engineering　and　compared　with　other　methods.　The　results　are　shown　to　be　reasonable.　The　effects　of　the　variation　of　parameters　such　as　pile　spacing　(s),　thickness　of　load　transfer　platform　(LTP)　(h)　and　tensile　stiffness　of　the　geosynthetic　(S-r)　on　the　pile　lateral　friction　and　the　settlement　of　pile-supported　reinforced　embankment　are　investigated.　As　s/d　increases,　the　elastic　zone　with　lateral　friction　resistance　becomes　shorter　and　shorter.　The　plastic　zones　at　both　ends　become　longer　and　longer.　The　maximum　settlement　generally　increases　with　the　increase　of　s/d.　When　s/d　＜=　4,　the　maximum　settlement　increases　little,　but　when　s/d　＞　4,　the　maximum　settlement　increases　large,　and　the　rate　is　4　similar　to　5　times　of　s/d　＜=　4.　With　the　increase　of　h/s,　the　length　of　elastic　zone　due　to　pile　side　friction　changes　little,　but　the　whole　zone　shifts　upwards.　The　maximum　settlement　shows　an　obvious　gradient　increase.　When　h/s　=　0.5　the　maximum　settlement　is　about　1.5　times　of　h/s　=　0.3　maximum　settlement.　With　the　increase　of　S-r,　the　whole　elastic　zone　of　pile　side　resistance　becomes　shorter　and　shifts　upwards.　The　maximum　settlement　decreases　in　a　gradient　way.　The　settlement　at　S-r　=　4000　is　about　0.75　times　of　that　at　S-r　=　1000.　This　paper　expands　the　settlement　theory　of　reinforced　embankment　and　is　closer　to　the　real　conditions,　which　has　certain　scientific　significance　and　application　value.