In　modern　engineering　practice,　the　simultaneous　exposure　to　high　temperatures　and　vibrations　can　threaten　the　security　of　the　structure.　In　this　paper,　a　novel　additional　damping　structures　with　entangled　metallic　wire　material　(EMWM)　are　proposed　and　its　vibration　characteristics　at　high　temperature　are　investigated.　Firstly,　a　thermal/vibration　coupling　test　platform　of　additional　damping　structures　is　designed　and　constructed,　and　a　high-temperature　vibration　pickup　method　is　adopted　to　extract　the　response　signals.　On　this　basis,　the　5–400Hz　frequency　sweep　tests　are　carried　out　under　the　unilateral　constraint　condition.　The　effects　of　excitation　magnitude,　ambient　temperature　and　EMWM　thickness　on　the　vibration　parameters　are　analyzed.　The　vibration　performance　is　evaluated　by　modal　identification　and　loss　factor　by　half-power　method.　The　results　show　that　the　damping　performance　of　the　constrained　damping　structure　and　insertion　damping　structure　is　better　than　that　of　the　free　damping　structure　under　different　excitation　levels;　the　increase　of　the　ambient　temperature　generates　a　greater　influence　on　the　vibration　damping　performance　of　the　structure,　but　it　still　has　a　good　stability;　the　amplitude　change　of　the　structure　is　more　apparent　through　the　increase　of　EMWM　thickness,　and　the　vibration　damping　performance　is　more　superior.　Under　extreme　engineering　environments,　a　new　approach　to　plate　damping　structures　is　provided　that　still　maintains　excellent　performance.　©　2024　Taylor　&　Francis　Group,　LLC.