▎ 摘　　要

NOVELTY - Preparing modified graphene comprises mixing graphene with 30% of hydrogen peroxide aqueous solution for 50-1000 times, heating the mixture at a temperature of 30-100 degrees C, and reforming the graphene. USE - The method is useful for preparing modified graphene that is useful in a nano-composite material (all claimed). ADVANTAGE - The method is capable of economically and efficiently preparing the high graphene with excellent physical property and without scratches. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a nano-composite material comprising graphene powder (0.1-15 pts. wt.), and membranous polymers.