Pile　foundation　is　widely　used　in　offshore　wind　turbines.　At　present，when　the　soil　structure　interactions　and　the　horizontal　displacement　of　pile　foundation　are　analyzed，the　p-y　curve　model　recommended　by　American　Petroleum　Institute　specification　is　often　adopted　for　calculation.　With　the　development　of　soil　structure　theory，when　the　p-y　curve　model　recommended　by　the　existing　API　specification　is　applied　to　the　analysis　and　calculation　of　large　diameter　piles　foundation，the　results　of　the　ultimate　soil　resistance　at　different　depths　is　underestimated　and　the　initial　foundation　reaction　modulus　is　overestimated，thus　the　accuracy　of　calculation　is　reduced.　As　to　this　problem，the　factors　that　affect　the　ultimate　soil　resistance　and　initial　foundation　reaction　modulus　in　the　existing　p-y　curve　model　are　analyzed　in　this　study.　A　finite　element　numerical　model　of　soil　structure　interactions　are　established，and　the　calculation　models　with　different　pile　diameters　and　soil　depths　are　discussed　and　the　data　regression　is　carried　out.　A　correction　coefficient　is　introduced　to　consider　the　size　effect　of　large　diameter　pile　foundation，and　the　variation　law　of　influence　index　of　different　factors　is　examined.　Finally，a　corrected　p-y　curve　model　for　pile　foundation　with　large　diameter　is　proposed.　Compared　with　the　results　of　model　test　and　field　test，the　calculation　of　ultimate　soil　resistance　and　initial　foundation　reaction　modulus　of　the　corrected　model　is　more　consistent　with　the　actual　situation，and　the　reliability　and　rationality　of　the　corrected　p-y　curve　model　are　verified.　©　2023　Science　Press.　All　rights　reserved.