Thermal　transport　properties　of　two-dimensional　(2D)　materials　have　been　extensively　investigated.　However,　the　microscopic　view　from　the　atomic　motion　is　lacking.　In　this　paper,　the　thermal　transport　in　buckling　2D　Germanene,　Arsenene,　and　Antimonene　are　studied　based　on　molecular　dynamics　(MD)　simulations　with　systematical　comparison　to　graphene.　It　was　found　that　the　thermal　conductivity　of　the　buckling　structures　is　20　60　times　lower　than　that　of　graphene　due　to　the　softened　phonon　modes　in　the　buckling　structures.　Besides,　the　phonon　modes　with　frequency　in　0　5　THz　are　contributing　to　the　discrepancy　in　the　overall　thermal　conductivity　among　buckling　structures.