▎ 摘　　要

NOVELTY - Preparing modified graphene oxide comprises (i) preparing graphene oxide (GO) by Hummers method, (ii) reacting aminopropyltriethoxysilane (APTES) with graphene oxide to obtain APTES-GO, (iii) reacting bromine-containing initiator with the APTES-GO obtained in the step (ii) under the action of catalyst to obtain graphene oxide- aminopropyltriethoxysilane-bromide (GO-APTES-Br), and(iv) selecting monomer having hydrophilic group, taking monomer and the GO-APTES-Br obtained in the step (iii), subjecting to surface-initiated atom transfer radical polymerization under the action of catalyst to obtain graphene oxide surface graft polymer. USE - The method is useful for preparing modified graphene oxide. ADVANTAGE - The method provides stable dispersion in a high temperature, high salt and weakly alkaline solution, especially for stable dispersion in a working fluid during oil and gas production.