Industrial chain is a concept in industrial economics, which is a chain-like relationship form objectively formed among various industrial departments based on certain technical and economic relations and according to specific logical relations and spatial and temporal layout relations. Industrial chain is a concept that includes four dimensions: value chain, enterprise chain, supply chain and spatial chain. These four dimensions form an industrial chain in the process of mutual docking and balance. This "docking mechanism" is the internal mode of industrial chain formation. As an objective law, it is like an "invisible hand" regulating the formation of industrial chain.