Based　on　the　characteristics　of　the　deep-water　floating　photovoltaic　platform　in　the　practical　engineering，a　arrangement　scheme　plan　is　proposed，and　a　numerical　calculation　model　of　the　photovoltaic　platform　and　the　mooring　structure　is　established，and　the　accuracy　of　the　calculation　model　is　verified　by　comparison.　According　to　the　measured　marine　environment　wind，wave，and　current　conditions，the　full-time　dynamic　coupling　calculation　and　analysis　of　the　mooring　structure　for　the　floating　photovoltaic　platform　are　carried　out　to　explore　the　motion　response　of　the　photovoltaic　platform　at　six　degrees　of　freedom　and　the　tension　response　of　the　mooring　structure　under　the　extreme　sea　conditions　in　the　0°，45°，and　90°　directions.　The　results　show　that　the　motions　of　the　six　degrees　of　freedom　of　the　photovoltaic　platform　all　respond　the　most　when　the　maximum　wave　height　occurs，and　the　surge　motion　in　the　0°　direction　and　the　roll　motion　in　the　90°　direction　are　the　most　significant；in　the　directions　of　0°，45°，and　90°，the　mooring　line　tensions　at　the　head　sea　side　are　the　largest，and　the　tension　responses　of　the　mooring　lines　at　the　back　swell　are　relatively　small；when　the　tension　responses　of　the　mooring　lines　reach　the　maximum，the　mooring　lines　in　the　direction　of　0°，45°，and　90°　are　taut，the　other　mooring　lines　show　the　relaxation　catenary　linear，which　preferably　reflects　the　tension　response　of　the　mooring　lines.　©　2023　Science　Press.　All　rights　reserved.