Abstract: The industrial system of coal resource-based cities is a coal-based industrial system that is gradually evolving and forming a coal industry. The transformation and upgrading of the coal industry will have a strong ripple effect, and comprehensively consider the components and structural factors of the coal-based industrial system. The effective transformation of the coal industry is of great significance. Based on the theory of industry chain and industrial network, this paper puts forward the concept of coal industry tree and builds a coal industry tree model through analogy analysis. Then, it analyzes the tree structure and function of coal industry and the evolution mechanism. Finally, the coal is briefly described. The Application Value and Path of Industry Tree in Discriminating the Direction of Coal Industry Transformation .