▎ 摘　　要

NOVELTY - Two-stage growth of high density, high electric conductivity, high heat conductivity graphene material involves obtaining graphene material by two-stage chemical vapor deposition method, controlling graphene layers to 1-2000 layers, and obtaining graphene material with a microscopic three-dimensional porous structure. USE - Two-stage growth of high density, high electric conductivity, high heat conductivity graphene material (claimed). ADVANTAGE - The two-stage growth of high density, high electric conductivity, high heat conductivity graphene material is enabled effectively. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene material, which involves chemical vapor depositing the ceramic powder as a substrate, coating ceramic powder with graphene to obtain ceramic base/graphene composite powder, grinding and tableting the ceramic base/graphene composite powder, regrowing graphene by chemical vapor deposition to obtain two-stage growth ceramic matrix/graphene composite powder, etching, drying and forming.