Based on the characteristics of complementarity, intersectionality and relevance of the online monitoring system and mobile inspection equipment for the cable body and the channel environmental state perception, a power cable and tunnel state perception method which is synergistic between the online monitoring system and the mobile inspection system is proposed.The bidirectional coordination strategy between the two enables them to cooperate with each other in fault diagnosis, fusion analysis of the host equipment and state inspection of the detection system itself, which effectively improves the intelligent level of power cable and tunnel operation and maintenance.