▎ 摘　　要

NOVELTY - The method involves heating a reaction furnace cavity to 600-1200 degrees centigrade under carrier gas protection atmosphere. A metal substrate is put into a reaction furnace cavity constant temperature area. Reducing gas is introduced. Carbon source gas is introduced into a reaction furnace cavity. Atmosphere of reducing gas and carrier gas are mixed. A three-dimensional connected graphene framework structure with high density is obtained. A three-dimensional graphene porous is obtained. The obtained three-dimensional graphene porous is pressed to form a graphene film. USE - Method for preparing a graphene film (claimed). ADVANTAGE - The film has high crystallization quality and flexibility, and excellent heat conduction and conductivity in an in-plane and vertical plane direction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a graphene film.