The　offshore　wind　turbine　(OWT)　is　a　high-rise　structure　that　is　extremely　sensitive　to　dynamic　loads　such　as　wind,　waves,　and　earthquakes.　Therefore,　in　order　to　avoid　resonance,　it　is　extremely　important　to　accurately　calculate　the　natural　frequencies　of　the　OWT　at　the　design　stage.　The　integrated　finite　element　model　of　DTU　(Technical　University　of　Denmark)　10　MW　OWT　is　established　based　on　OpenSees　finite　element　software.　The　correctness　of　the　superstructure　simplification　method　is　confirmed　by　comparing　it　to　the　frequencies　calculated　by　the　wind　turbine　dynamic　analysis　software　HAWC2　for　the　single-blade　model　and　the　fixed　constraint　model　at　the　bottom　of　the　tower.　The　frequencies　and　mode　shapes　calculated　by　the　overall　model　are　compared　with　those　calculated　by　the　fixed　model　at　the　mudline　and　the　concentrated　mass　model　at　the　top　of　the　tower.　Then,　the　parameters　of　the　soil　shear　modulus　G0,　void　ratio　e,　pile　embedded　length　L,　pile　diameter　D,　water　depth,　and　blade　stiffness　are　analyzed　using　the　lumped　mass　model　and　the　blade　model　at　the　top　of　the　tower,　and　some　regular　conclusions　about　the　variation　of　natural　frequency　with　the　parameters　are　obtained.　Finally,　based　on　the　blade　model,　the　influence　of　short-term　cyclic　loading　on　the　natural　frequency　for　OWT　monopiles　in　dense　sand　is　studied.　The　results　indicate　that　the　pile-soil　interaction　has　a　significant　impact　on　the　natural　frequencies,　the　blade　has　a　higher　influence　on　the　second　bending　frequency　of　the　OWT,　and　the　front-after　direction　is　more　significantly　impacted　than　the　side-side　direction.　The　short-term　cyclic　loading　are　unlikely　to　significantly　affect　natural　frequency　for　OWT　monopiles　in　dense　sand.　©　2023　Author(s).