In　this　work,　the　creep　behaviors　of　the　graphitic　and　graphite-TiB2　composite　as　cathode　materials　have　been　investigated　at　high　temperature　aluminum　electrolysis　for　discussing　the　role　of　TiB2　particles　in　creep　resistance　and　mechanical　properties　connected　with　the　microstructural　evolution　involving　electrolyte　penetration　and　cracking.　The　graphite-TiB2　composite　has　superior　creep　resistance　over　the　graphitic　sample.　The　corresponding　creep　strain　can　be　as　low　as　-0.2%　after　the　high　temperature　electrolysis.　The　addition　of　TiB2　particles　greatly　densifies　the　prepared　composite　with　low　porosity,　resulting　in　the　reduction　of　penetrating　channels.　The　well-wetted　TiB2　particles　by　liquid　Al　generate　a　protective　dense　Al　layer　on　the　surface　of　composite,　greatly　blocking　the　electrolyte　penetration.　In　turn,　liquid　Al　may　slowly　penetrate　into　the　composite　via　the　cracks　formed　channels.　The　fracture　strength　of　the　graphite-TiB2　composite　increases　from　41.6　MPa　to　48.9　MPa　after　creep　test　at　high　temperature　loading.　Such　improved　properties　should　be　attributed　to　the　combined　mechanism　with　reduced　micro-cracks,　decreased　penetrating　channels　and　the　reinforcement　due　to　addition　of　TiB2　particles.