Graphite, as an important material for Li battery anode and graphene preparation, can exist in two phases: the Bernal (2H) phase and the rhombohedral (3R) phase. The 2H phase has relatively low energy and high proportion in graphite powder, while the 3R phase shows the opposite properties. However, the decrease of the flake graphite size gives rise to the proportion of 3R phase up to 50%.