With the development of the national economy and the increase of the power supply voltage level of the city network, the XLPE insulated power cable (XLPE) has been acquired at home and abroad for its reasonable process and structure, excellent electrical performance and safe and reliable operation characteristics. The more widely used. Especially in the field of high voltage transmission, great progress has been made. Compared with ilfilledl cables, cross-linked cables are easy to lay and install, easy to operate and maintain, and there is no turbulence of oil. However, recent years of operation and research have shown that the insulation of XLPE cables is prone to dendrite discharge during operation, causing insulation aging damage, which seriously affects the service life of XLPE insulated power cables. Therefore, fully understanding the insulation characteristics of cross-linked cables, and timely and effectively discovering and preventing certain defects in insulation are of great significance for ensuring the safe operation of equipment and even systems. The main factors affecting the insulation of the cross-linked cable and the principle of the handover test of the cable are expounded. It is considered that it is necessary and feasible to carry out the AC withstand voltage test on the cross-linked cable in the field.