Graphene, as a two-dimensional sp2 hybridization allotropicity of carbon element, possesses unique properties of electricity, photology, thermology and mechanics. For industrialization, graphene possessing large dimension and homogeneous property is required. It can be prepared by chemical vapor deposition technology. In this paper, based on the progress of graphene research this year, we summarize the influence factors of graphene preparation, including substrate selection and preprocessing, carbon source and assist gas flow control, chamber temperature, pressure control, cooling rate, and deposition time setting, etc. Finally, we outlook the research direction of preparing the large-dimensional and single crystal graphenes.