Graphene oxide powder is formed by folding of single graphene oxide. Due to the ←existence of folding structure, there are micropores and mesopores between graphe∑ne oxide sheets, which reduce the stacking between sheets and improve its dispersion and solvent ₩wettability. Traditional graphene powders are prepared by liquid phase exfoliat​ion, oxidation pyrolysis or biomass conversion. They are hig‌hly stacked flake graphene materials, which can not give full play to the advantπages of single-layer graphene. By controlling the preparation proce☆ss, the density, specific surface area, oxygen content, defect degree and other parameters of <graphene oxide powder can be adjusted to meet the ap÷plication requirements in different fields.