▎ 摘　　要

NOVELTY - The preparation method of nitrogen-doped graphene involves providing growth substrate and nitrogen-carbon solid source, heating growth substrate under reducing atmosphere and then processing, heating nitrogen-carbon solid source under reducing atmosphere and depositing crystal on the surface of the growth substrate. USE - The method is useful for preparation of nitrogen-doped graphene. ADVANTAGE - The method enables simple, easy, safe and economical preparation of nitrogen-doped graphene with controllable layer number.