When　the　submarine　is　sailing　at　full　speed,　the　power　cabin　has　an　abnormally　high　temperature.　However,　in　the　previous　research　on　the　vibration　reduction　design　of　the　foundation,　the　influence　of　high　temperature　on　the　vibration　characteristics　of　the　foundation　is　not　taken　into　account.　In　this　paper,　a　new　composite　foundation　with　entangled　metallic　wire　material　(EMWM)　is　presented　to　reduce　the　vibration　of　the　foundation.　The　energy　transfer　path　of　the　foundation　was　obtained　by　the　power　flow　method,　and　then　the　layout　of　EMWM　was　determined.　The　optimization　of　the　constraining　layer　was　carried　out　by　modal　analysis.　The　damping　performance　of　the　composite　foundation　with　EMWM　was　validated　by　the　thermal-vibration　joint　test.　The　results　show　that,　at　room　temperature,　the　composite　foundation　has　remarkable　vibration　reduction　efficiency　in　the　middle　and　high-frequency　bands.　The　maximum　insertion　loss　can　reach　15.37　dB.　The　insertion　loss　varies　with　the　location　of　the　excitation　point.　As　the　temperature　rises　to　300　degrees　C,　the　insertion　loss　in　the　low-frequency　band　was　improved,　and　the　insertion　loss　is　not　influenced　by　the　excitation　position.