How　to　further　reduce　vibration　and　noise　is　a　major　challenge　for　modern　ship　design.　High-temperature　environment　will　significantly　influence　the　mechanical　properties　(such　as　elastic　modulus　and　stiffness)　of　the　ship＇s　foundation.　These　properties　will　have　a　serious　impact　on　the　inherent　vibration　characteristics　of　the　foundation.　In　this　paper,　a　simplified　foundation　is　taken　as　the　research　object,　and　a　thermal-vibration　joint　test　system　is　developed　for　investigating　the　thermal　modal　characteristics　of　the　foundation　under　different　temperatures.　The　joint　test　system　consists　of　a　transient　aerodynamic　heating　environment　simulation　system　and　a　vibration　excitation　and　acquisition　system.　Finite　element　method　(FEM)　is　used　to　analyze　the　distribution　of　thermal　fields.　The　influence　of　the　ceramic　rods　and　the　different　ambient　temperatures　on　the　modal　characteristics　of　the　foundation　is　studied.　The　results　indicate　that　the　effect　of　ceramic　rods　on　the　modal　characteristic　of　the　foundation　is　negligible.　The　results　also　show　that　the　greater　the　vibration　response　amplitude　is　as　the　temperature　increases　and　the　first-order　natural　frequency　does　not　change,　the　smaller　the　second-order　natural　frequency　and　the　damping　ratio　will　become　smaller.　The　variation　of　natural　frequency　and　damping　ratio　of　the　foundation　under　different　temperature　conditions　can　provide　a　reliable　experimental　basis　for　the　design　of　the　vibration　and　noise　reduction　of　the　ship＇s　foundation　in　the　thermal-vibration　environment.