This　study　investigates　the　vibration　and　acoustic　properties　of　porous　foam　functionally　graded(FG)plates　under　the　influence　of　the　temperature　field.The　dynam-ics　equations　of　the　system　are　established　based　on　Hamilton＇s　principle　by　using　the　higher-order　shear　deformation　theory　under　the　linear　displacement-strain　assumption.The　displacement　shape　function　is　assumed　according　to　the　four-sided　simply-supported(SSSS)boundary　condition,and　the　characteristic　equations　of　the　system　are　derived　by　combining　the　motion　control　equations.The　theoretical　model　of　vibro-acoustic　coupling　is　established　by　using　the　acoustic　theory　and　fluid-structure　coupling　solution　method　under　the　simple　harmonic　acoustic　wave.The　system＇s　natural　frequency　and　sound　transmission　loss(STL)are　obtained　through　programming　calculations　and　compared　with　the　literature　and　COMSOL　simulation　to　verify　the　validity　and　reliability　of　the　theoretical　model.The　effects　of　various　factors,such　as　temperature,porosity　coeffi-cients,gradient　index,core　thickness,width-to-thickness　ratio　on　the　vibration,and　STL　characteristics　of　the　system,are　discussed.The　results　provide　a　theoretical　basis　for　the　application　of　porous　foam　FG　plates　in　engineering　to　optimize　vibration　and　sound　transmission　properties.