With　the　development　of　pile-soil　interaction　theory,　at　present　the　sand　p　-y　model　of　API　specification　is　adopted　to　the　analysis　and　calculation　of　large　diameter　piles　under　horizontal　static　load,　but　the　results　of　the　ultimate　soil　resistance　at　different　depths　is　underestimated　and　the　initial　foundation　reaction　modulus　is　overestimated,　thus　the　calculation　results　are　obtained　with　large　errors.　For　this　problem,　a　finite　element　numerical　model　of　pile-soil　interaction　is　established　in　this　study,　and　the　calculation　models　under　horizontal　static　load　with　different　pile　diameters　and　soil　depth　are　analyzed　and　the　data　regression　is　carried　out.　A　correction　coeffi-cient　is　introduced　to　consider　the　size　effect　of　large　diameter　pile,　and　the　variation　law　of　influence　index　of　different　factors　is　discussed.　Finally,　a　corrected　sand　p　-y　curve　model　for　single　pile　foundation　with　large　diameter　more　than　2　m　is　proposed.　Compared　with　the　results　of　model　test　and　field　test,　the　calculation　results　of　ultimate　soil　resistance　and　initial　foundation　reaction　modulus　from　the　corrected　model　is　more　in　accord　with　the　actual　situation.