Offshore　wind　turbine　system　(OWTs)　in　areas　of　earthquake　activity　are　potentially　threatened　by　a　combination　of　earthquake,　wave,　and　wind　loads.　Thus,　an　analytical　solution　of　OWTs　supported　by　monopile　on　visco-elastic　half-space　is　developed　to　investigate　the　dynamic　responses　of　OWTs　subjected　to　the　earthquake,　wave,　and　wind　loads.　Firstly,　the　OWTs　supported　by　monopile　considering　a　series　of　coupled　interactions　is　estab-lished,　in　which　monopile　end　soil-soil　viscoelastic　half-space　interaction　is　solved　by　static　spring-damping　system,　monopile-soil　and　water　interaction　are　solved　by　analytical　horizontal　impedance,　monopile-wave　interaction　is　solved　by　linear　wave　theory,　and　tower　drum-wind　interaction　is　solved　by　wind　loads　applied　on　the　turbine　blades.　Then,　the　displacement　response　of　OWTs　supported　by　monopile　is　further　obtained　based　on　the　continuity　conditions　between　the　monopile　and　tower　drum.　Finally,　the　present　solution　degenerated　into　a　rigid　foundation　and　verified　the　rationality　with　existing　analytical　and　substructure　methods.　In　addition,　some　critical　parameters　are　further　conducted　by　using　the　present　solution.　The　results　indicate　that　it　is　necessary　to　consider　the　couple　influence　of　earthquake,　wave,　and　wind　loads　in　the　design　of　OWTs　supported　by　monopile.