King-Mazon digital tube manufacturing technology and equipment began to install applications for large launch vehicles. The Long March 5 Series Launch Vehicle is a new generation of Chinese carrier rockets with a core stage diameter of 5 meters. The long March 5 series, developed by the China academy of launch vehicle technology, adopts the ideas of generalization, serialization and combination. The series consists of the basic long March 5 carrier rocket with a two-stage semi-configuration, the first-stage semi-configuration long March 5  carrier rocket without the second stage, and the long March 5 / expedition-2 carrier rocket with the upper stage. The geosynchronous transfer orbit and low earth orbit carrying capacity will reach 14 tons and 25 tons respectively. The rockets will be used in the future construction of China's tiangong space station, the Beidou navigation system, the third phase of lunar exploration and other deep space exploration.