▎ 摘　　要

NOVELTY - Preparing an edge of the nitrogen-doped graphene comprises (1) firstly, putting the graphite powder and nitrogen-containing polymer into solid-phase ball milling to obtain powder, (2) mixing the powder with water, and centrifuging to remove the redundant of the graphite powder and nitrogen-containing polymer, and (3) dialyzing the obtained solution with water until the solution becomes neutral. USE - The method is useful for preparing edge of nitrogen-doped graphene (claimed). ADVANTAGE - The method provides the nitrogen-doped graphene at low temperature in an environmentally-friendly manner.