This　paper　presents　a　numerical　study　which　investigates　the　effect　of　high　temperature　on　the　dynamic　response　of　a　vibro-acoustic　system　excited　by　165　dB　acoustic　pressure　based　on　a　hybrid　finite　element-statistical　energy　analysis　(FE-SEA)　in　1800　Hz　broadband　frequency.　The　study　takes　into　consideration　the　thermal　stress　and　temperature-dependent　material　properties　mainly　through　which　the　thermal　environment　influences　the　dynamic　response.　The　coupled　system　is　composed　of　an　FE　model　of　X-43A　and　an　SEA　model　of　its　internal　acoustic　field.　The　energy　response　distribution　at　the　top-surface　in　the　space　and　frequency　domain　are　obtained,　which　reveals　that　the　thermal　stress　has　only　slight　effect　on　the　natural　frequencies　due　to　the　unconstrained　structure　condition.　The　velocity　response　has　a　similar　trend　as　that　in　room-temperature,　with　a　small　decrease　of　root　mean　square　(RMS)　and　power　spectral　density　(PSD)　in　most　bands.　Changes　in　material　property　reduce　obviously　the　natural　frequencies　of　the　structure,　and　shift　the　response　peaks　to　lower　frequencies.　For　the　central　part　of　the　structure,　the　material　property　exerts　an　increasing　effect　on　the　RMS　value　and　energy　at　several　bands,　while　for　the　forepart　the　material　property　has　a　decreasing　effect　on　the　RMS　value.