New dry-process cement refers to the cement produced by the new process of decomposition outside the kiln. Its production is based on suspension preheater and decomposition technology outside the kiln. It adopts new raw materials, fuel pre-homogenization technology and energy-saving grinding technology and equipment, and the whole line adopts computers. Distributed control realizes the automation and efficiency of cement production process, low consumption and environmental protection. The new dry process cement production technology was developed in the 1950s. So far, Japan and Germany have developed, and the rate of new dry process cement clinker production equipment with suspension preheating and predecomposition as the core accounts for 95%. The precalcining kiln was put into operation in 1976. The technical advantages: rapid heat transfer, high thermal efficiency, larger output per unit volume than wet cement, and lower heat consumption.