▎ 摘　　要

NOVELTY - Preparing controllable graphene layer, comprises adding amorphous carbide in a heating furnace, introducing inert gas to remove air under normal pressure, quickly heating, maintaining gas flow rate of inert gas by supplying halogen gas or halogen containing gas, and reacting non-carbon element of carbide to form halide discharge to obtain carbon material, and stopping the supply of halogen gas or halogen containing gas, introducing and maintaining the inert gas to remove halide gas residue and reaction by-products, and cooling to obtain a sample containing graphene. USE - The method is useful for preparing controllable graphene layer (claimed). ADVANTAGE - The method satisfies different field for different requirements of graphene layer, has low adhesion between graphene and substrate, easily facilitates peeling off from the substrate, has mild reaction conditions at normal pressure. DETAILED DESCRIPTION - Preparing controllable graphene layer, comprises: (a) adding amorphous carbide in a heating furnace, introducing inert gas to remove air under normal pressure, quickly heating to 200-1400 degrees C, maintaining gas flow rate of inert gas by supplying halogen gas or halogen containing gas, and reacting non-carbon element of carbide to form halide discharge to obtain carbon material, and (b) maintaining constant temperature, stopping the supply of halogen gas or halogen containing gas, introducing and maintaining the inert gas to remove halide gas residue and reaction by-products, and cooling to room temperature under an inert gas atmosphere to obtain a sample containing graphene.