Considering　soil　arching　effect,　the　reasonable　passive　load　of　rigid　pile　was　deduced　from　the　modified　formula　of　Boussinesq,　and　the　distribution　of　pile＇s　internal　force　could　be　drawn　by　nonlinear　subgrade　reaction　method.　Based　on　this,　the　allowable　shear　strength　controlled　by　bending　strength　of　pile　was　obtained,　and　then　applied　was　to　limit　equilibrium　method.　Above　all,　a　calculation　method　for　stability　of　rigid　pile　composite　foundation　under　embankment　load　was　suggested　based　on　calculation　of　pile　internal　force.　Finally,　a　comparison　was　done　among　this　mothod　with　3D　numerical　simulation　method,　traditional　limit　equilibrium　method　and　the　equivalent　sand　pile　method.　The　results　show　that　failure　mechanisms　of　rigid　pile　composite　foundation　under　embankment　load　can　be　effectively　reflected　and　more　reasonable　safety　factors　of　embankment　can　be　obtained　through　the　proposed　method.　©　2017,　Central　South　University　Press.　All　right　reserved.