Offshore　wind　turbines　(OWTs)　are　subject　to　the　combined　action　of　dynamic　environmental　loads　including　wind,　waves,　and　earthquake　loads.　This　paper　proposes　an　analytical　solution　for　the　dynamic　response　of　OWTs　supported　by　pipe　pile　in　heterogeneous　viscoelastic　soil.　The　analytical　model　accounts　for　various　interactions　that　affect　OWTs　dynamic　response.　The　pipe　pile-internal　soil　is　calculated　by　utilizing　the　Helmholtz　method,　the　pipe　pile-external　soil　is　calculated　by　utilizing　the　transfer　matrix　method,　the　pipe　pile-wave　is　evaluated　by　utilizing　the　diffraction　wave　theory,　and　the　tower　drum-wind　is　calculated　by　utilizing　the　Bernoulli　method.　The　dynamic　responses　of　the　pipe　pile　and　tower　are　established　by　enforcing　the　boundary　conditions　of　the　displacement　continuity　and　stress　equilibrium.　The　developed　analytical　solution　is　degenerated　into　simplified　analytical　solutions　under　various　conditions,　which　was　validated　by　comparing　its　predictions　with　the　results　of　available　numerical　and　analytical　solutions.　The　validated　simplified　solution　is　then　utilized　investigate　the　effects　of　some　critical　parameters　on　OWTs　response.　The　results　show　that　the　OWTs　response　under　the　combined　action　of　earthquake,　wave　and　wind　loads　is　strongly　affected　by　the　presence　of　water　and　soil　inside　the　pipe　pile,　soil　radial　heterogeneity.