The ability of bituminous coal to bond with specialized anthracite after heating under specified conditions is one of the important criteria for coal classification and an important indicator for smelting clean coal. The higher the bonding index, the higher the coking property. Adhesive property refers to the ability of coal particles to bond together into blocks during the dry distillation process due to the decomposition and melting of organic matter in coal. It is commonly measured by the maximum thickness Y value of the gelatinous layer and the adhesive index G value. The larger the two, the better the adhesive property. The adhesive property of coal is the main basis for evaluating whether bituminous coal can be used for coking, and it is also an important basis for evaluating low-temperature dry distillation, gasification, and power coal. The cohesiveness of coal is a necessary condition for coking, and coal with good coking properties must have good cohesiveness. When the temperature of coal with adhesive properties rises to 300C, gaseous products begin to precipitate, and as the temperature increases, tar continuously precipitates, forming a gelatinous body. The quantity and quality of gelatinous body are the key factors affecting the quality of coke.