▎ 摘　　要

NOVELTY - Preparing graphene comprises adding mixture of graphite oxide and water in aqueous ammonia, stirring the mixture for 10-30 minutes, adjusting pH value of the solution to 7-8 degrees C and then standing for 5-10 minutes, centrifuging the graphite oxide in a centrifuge for 5-65 minutes, pouring the supernatant to obtain neutral graphite oxide deposition, mixing obtained product with hydrazine hydrate according to volume ratio of 1:5-5:1, ultrasonically dispersing in the solution at 150-250 degrees C for 10-60 hours, and filtering the dispersed solution and then washing by water and drying. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The method simply and economically prepares the graphene with high yield.