Abstract: Graphyne, a kind of sp-sp² hybrid all-carbon two-dimensional material, is currently one of the most interesting carbon allotropes besides graphene. It has potential applications and characteristic properties because of its unique electronic structure. First, the concept and properties of graphyne are summarized, then the characteristic properties of graphynes and their potential applications are reviewed, before some methods and ways to synthesize the two-dimensional structures are proposed, and finally a short perspective on the study of graphynes is given.