Using　paraffin　as　phase　change　material,　the　melting　behaviors　of　pure　phase　change　material　and　phase　change　material　embedded　in　open-cell　metal　foams　(composite　phase　change　material)　at　different　inclination　angles　are　studied.　Experimental　system　enabling　continuous　rotating　is　designed　and　built　to　explore　the　influence　of　inclination　angles　on　phase　interface　evolution　and　temperature　responses　inside　pure　and　composite　phase　change　materials.　Constant　wall　temperature　is　applied　on　one　surface　while　others　are　thermally　insulated.　Experiments　are　carried　out　at　angles　of　0　degrees,　30　degrees,　60　degrees,　and　90　degrees　respectively.　The　effects　of　inclination　on　the　melting　behavior　of　phase　change　materials　are　analyzed　by　visualizing　the　solid-liquid　interface　and　analyzing　the　temperature　responses.　Results　demonstrate　that　the　inclination　angle　has　a　great　influence　on　the　formation　and　development　of　natural　convection　during　melting　of　pure　phase　change　material,　affecting　the　solid-liquid　interface　propagation　and　heat　transfer　rate.　Compared　with　the　case　at　90　degrees,　the　full　melting　time　is　reduced　by　12.28%,　22.81%　and　34.21%　at　0　degrees,　30　degrees　and　60　degrees,　respectively.　However,　when　phase　change　material　is　melted　in　open-cell　metal　foam,　heat　conduction　dominates,　and　inclination　angle　has　little　influence.　Melting　fractions　at　different　inclination　angles　are　the　same　and　temperature　curves　at　given　points　overlaps　with　each　other.