Because of the relationship between molecular structure, general insulating materials have their basically insurmountable defects. Polymer insulators are made up of a group of long chains connected by molecules. When heated, the distance between molecules increases, which results in the weakening, softening and even melting of polymer molecular structure. Therefore, if some fixed chains can be crossed between the long chains of adjacent molecules, it will be able to prevent or alleviate the phenomenon of polymer molecule carbonization after being heated, thereby increasing its physical and mechanical properties, which will be of great value for electrical insulation. Chemically, this process of changing the molecular structure of polymers into three-dimensional networks is called Crosslinking. Electron irradiation is an effective method to cross-link the molecules of insulating materials in wire manufacturing. Reliability, homogeneity, chemical reaction rate and reproducibility are very high. Especially for thin insulated wires or smaller cables, electron irradiation is a good method. Electron irradiation cross-linking provides a good direction for the light, thin, short and small requirements of various wire products.