Stearic　acid　(SA)　is　a　promising　phase　change　material　(PCM)　for　thermal　energy　storage　applications.　In　order　to　improve　the　shape　stability　and　thermal　conductivity　of　SA,　a　novel　shape-stabilized　PCM　was　prepared　through　incorporation　of　SA　into　a　three-dimensional　fluffy　ultrathin-wall　graphitic　hierarchical　porous　carbon　(GHPC)　having　large　specific　surface　area　and　high　pore　volume　in　this　study.　The　microstructure,　chemical　structure,　thermal　stability,　thermal　storage　properties　and　thermal　conductivity　of　GHPC　and　those　of　as-prepared　SA/GHPC　composites　were　determined　using　various　characterization　techniques.　Furthermore,　the　effects　of　the　content　of　GHPC　on　the　thermal　properties　of　SA/GHPC　composite　PCMs　were　investigated.　The　results　show　that　GHPC　efficiently　enhances　both　the　shape-stability　of　composite　PCMs　and　their　thermal　conductivity.　The　maximum　loading　of　SA　in　the　composite　is　85　wt%　without　any　liquid　leakage.　The　prepared　composite　displays　a　lower　melting　temperature　and　a　higher　freezing　temperature　compared　to　those　of　pure　SA.　Meanwhile,　the　composite　melts　at　67.5　degrees　C　with　a　melting　enthalpy　of　171.5　J/g　and　solidifies　at　68.4　degrees　C　with　a　freezing　enthalpy　of　170.0　J/g,　which　correspond　to　the　thermal　storage　capabilities　of　98.2%　and　98.5%,　respectively.　In　addition,　its　thermal　conductivity　was　determined　to　be　0.879　W/m　K,　which　is　3.502　times　higher　than　the　pure　SA.　More　importantly,　the　composite　possesses　excellent　thermal　reliability　after　over　at　least　600　thermal　cycles.　Therefore,　the　as-prepared　composite　is　a　desirable　candidate　for　low-temperature　thermal　energy　storage　applications.