Earthquakes　occur　frequently　in　China　＇　s　offshore　areas,　and　seismio　aotions　significantly　affeot　the　stability　of　offshore　wind　power　foundations　and　wind　turbine　structures.　Here,　to　correctly　and　effectively　calculate　seismic　dynamic　responses　of　offshore　wind　power　structures,　a　viscoelastic　artificial　boundary-based　3D　layered　soil　seismic　equivalent　node　force　calculation　formula　was　derived　according　to　wave　theory　and　Snell　law,　and　its　correctness　was　verified.　Then,　taking　the　foundation　of　a　certain　wind　power　field　in　Putian,　Fujian　Province　as　an　example,　a　3D　integrated　numerical　analysis　model　for　5　MW　wind　turbine-single　pile-layered　seabed　was　established　to　analyze　dynamic　response　of　offshore　wind　power　under　earthquake.　The　study　showed　that　when　earthquake　occurs,　responses　of　soil　bodies　at　different　positions　in　foundation　are　different,　for　shallow　soil　body　around　pile,　the　closer　the　distance　to　pile　foundation,　the　smaller　the　soil　body　acceleration　response,　pile　foundation　can　have　a　certain　suppressing　effect　on　acceleration　of　shallow　layer　soil　body　around　piles;　effects　of　pile　foundation　on　shear　strain　of　soil　layers　at　different　depths　also　have　larger　differences;　for　wind　turbine　structure,　the　maximum　displacement　occurs　at　tower　top,　while　the　maximum　acceleration　and　the　maximum　stress　occur　in　middle　of　tower.　©　2025　Chinese　Vibration　Engineering　Society.　All　rights　reserved.