Graphite oxide is obtained by oxidation of graphite with strong oxidizing agents, forming hydroxyl, epoxy and carboxyl groups on the six-membered ring of the graphite layer. On the one hand, the oxygen-containing groups are hydrophilic, and their introduction improves the water solubility of graphene, making the graphite oxide more soluble in water and increasing its stability, which is mostly used in scientific research to prepare modified graphene. On the other hand, the introduction of oxygen-containing groups makes the graphite layer spacing larger due to the spatial resistance effect, which reduces the agglomeration phenomenon between graphite layers. Graphite oxide is the basic step in the preparation of graphene.