▎ 摘　　要

NOVELTY - Preparation of composite material involves coating silicon dioxide-modified graphene oxide on the surface of the cationic polystyrene microspheres to obtain silicon dioxide-modified graphene oxide cationic polystyrene microsphere composite, calcining and reducing the obtained composite to obtain silicon dioxide modified graphene, mixing the obtained silicon dioxide modified graphene with polyvinylidene fluoride, forming into a film and hot-pressing. USE - Preparation of composite material. ADVANTAGE - The method provides composite material having high dielectric constant, low dielectric loss and excellent overall performance.