Volatile matter refers to the products of heating and decomposition of organic matter and some minerals in coal, and its size is related to the degree of coal metamorphism. The higher the degree of coal metamorphism, the lower the volatile matter. When coal is heated under high temperature and isolated air conditions, the gas and liquid products discharged are called volatile matter, which affects the coking rate, coke oven gas, tar yield, and coke quality. Coal with high volatile matter has a high yield of chemical by-products during dry distillation, making it suitable as a low-temperature dry distillation or gasification raw material; Bituminous coal with moderate volatile matter has good cohesiveness and is suitable for coking. In coal blending and coking, the volatile matter is used to determine the coal blending ratio, and the volatile matter of the mixed coal is controlled within the appropriate range of 25% -31%. The main components of volatile matter are methane, hydrogen, and other hydrocarbons. It is one of the important indicators for identifying the type and quality of coal. Generally speaking, as the degree of coal metamorphism increases, the volatile matter of coal decreases. Lignite and gas coal have higher volatile matter, while lean coal and anthracite have lower volatile matter