▎ 摘　　要

NOVELTY - Preparing large size single crystal graphene comprises depositing organic gas, hydrogen gas and inert gas on metal surface of a large size single crystal graphene at greater than 800 degrees C under normal pressure for 20-40 minutes and growing environmental air pressure of 1-300 Pascal for 1 minute to 2 hours in a flow field, where the organic gas includes alkanes, alkenes, alkynes and aromatic hydrocarbons such as carbon-containing gases, the metal surface comprises copper, molybdenum and other metal surfaces and the flow field comprises flow rate, flow direction and air pressure. USE - The method is useful for manufacturing large size single crystal graphene (claimed).