The eight indexes of two kinds of coal in Jizhong Energy refer to moisture, ash, fraction, fixed carbon content, total sulfur, calorific value, maximum thickness of colloidal layer and adhesion index. The existence of water is extremely unfavorable to the utilization of coal, which not only wastes a lot of transportation resources, but also when coal is used as fuel, the water in coal will become steam when it evaporates, consuming heat. The residue left after coal is completely burned is called ash, especially in ash and inherent ash. When coal is heated at high temperature and isolated from air, the gaseous and liquid products are called volatiles. Fixed carbon content refers to the residue after removing water, ash and volatile matter, and is an important index to determine the use of coal. Fixed carbon content refers to the residue after removing water, ash and volatile matter, and is an important index to determine the use of coal. Calorific value refers to the heat generated by the complete combustion of coal per unit mass, which is mainly divided into higher calorific value and lower calorific value. When bituminous coal is heated to a certain temperature, the maximum thickness of the colloid layer formed is the maximum difference between the upper and lower colloids measured by the probe when measuring the index of bituminous coal colloid layer. The ability of special anthracite to bond with bituminous coal after heating under specified conditions is one of the important standards for coal classification and an important index for smelting clean coal.