Taking　a　large-scale　photovoltaic　power　station　in　alpine　and　high-altitude　area　with　flat　uniaxial　photovoltaic　racking　system　as　the　background，relying　on　ABAQUS　finite　element　simulation　software，we　constructed　an　integrated　three-dimensional　finite　element　model　of　large-span　flat　uniaxial　photovoltaic　bracketing-foundation-panel，explored　the　loading　characteristics　of　the　key　components　of　the　flat　uniaxial　photovoltaic　tracking　system　and　the　mechanism　of　instability　deformation　in　an　extreme　environment，and　provided　the　targeted　optimization　design　suggestions.　The　results　show　that，under　extreme　wind　load，the　maximum　stress　of　purlins　in　this　large-span　PV　system　reaches　544.4　MPa　and　the　maximum　displacement　of　columns　reaches　76.3　mm　at　the　maximum　tracking　angle，resulting　in　the　potential　risk　of　yield　damage　of　local　purlins　and　H-type　steel　piles；the　deformations　of　superstructure　members　are　related　to　their　locations，and　the　overall　performance　shows　that　they　are　distributed　in　a　wavy　pattern　along　the　long　axis　of　the　main　girder，the　mid-span　position　of　the　two　columns　also　has　a　large　displacement.　The　maximum　deformation　under　wind　load　is　even　153.2　mm，which　is　most　obvious　at　the　cantilever　end　of　the　PV　module，and　it　is　proposed　to　enhance　the　strength　of　the　local　components　or　change　the　local　structural　characteristics　to　enhance　the　overall　stability　of　the　large-span　flat　uniaxial　tracking　PV　system.　©　2024　Science　Press.　All　rights　reserved.