A　fluffy　ultrathin-wall　mesoporous　surface　carbon　foam　(UMSCF)　with　high　thermal　conductivity　was　prepared　via　carbon-thermal　reduction　reaction　between　a　carbon　foam　and　aluminium　nitrate,　and　then　used　as　a　supporting　material　for　stearic　acid　(SA)　to　form　shape-stabilized　composite　phase　change　materials　(PCMs).　The　UMSCF　and　the　as-prepared　SA/UMSCF　composite　PCMs　were　characterized　by　SEM,　TEM,　XRD,　Raman,　BET,　FTIR,　wettability　test,　compression　test,　TG,　DSC,　thermal　cycling　test　and　laser　flash　method,　respectively.　Results　shows　that　the　carbon-thermal　reduction　temperature　greatly　influences　the　microstructures　of　the　UMSCF,　and　the　UMSCF　prepared　at　1600　°C　(UMSCF-1600)　possesses　good　lipophilicity,　high　thermal　conductivity　and　superior　mechanical　properties.　The　prepared　UMSCF　as　supporting　matrix　simultaneously　improves　thermal　conductivity　and　shape-stabilization　of　PCMs,　as　well　as　retains　relative　high　phase　change　enthalpy.　The　melting　and　freezing　enthalpy　for　SA/UMSCF-1600　composite　was　measured　as　149.3　and　151.2　J/g,　respectively.　The　thermal　conductivity　of　the　composite　PCMs　is　as　high　as　1.725　W/m　K,　which　increases　by　about　6.791-fold　compared　with　pristine　SA.　Meanwhile,　the　composites　display　good　thermal　reliability　and　chemical　stability,　suggesting　their　promising　characteristics　for　thermal　management　applications.　©　2020　The　Korean　Society　of　Industrial　and　Engineering　Chemistry