▎ 摘　　要

NOVELTY - The method involves weighing a certain mass of expandable graphite, putting into the bottom of the crucible, putting the crucible into the muffle furnace, and carrying out segmented calcination. The product in the crucible is taken out, and the graphene is obtained by high-speed crushing. The broken graphene is calcined in sections under the protection of an inert atmosphere. The temperature is lowered, after the calcination is completed, the inert atmosphere is replaced with an air atmosphere, and the temperature is naturally lowered, after heat preservation to obtain defective graphene. USE - Preparation method of defective graphene. ADVANTAGE - The method provides defect graphene with low cost and simple operation step in the drying environment, the reaction condition is convenient and controllable, and the needed device is simple. The preparation process is green and environment-friendly, and the defect graphene still keeps the original graphene structure, and only partial crystal lattice is absent. DESCRIPTION OF DRAWING(S) - The drawing shows a preparation process of the invention intermediate product graphene and defect graphene SEM photograph. (Drawing includes non-English language text).