Abstract: With the continuous expansion of urban scale, the underground pipeline network system is becoming increasingly complex. How to carry out power cable operation and maintenance more conveniently, safely, and efficiently has become a difficult problem that restricts the development of the cable industry. The intelligent operation and maintenance assistance system based on hybrid reality (MR) technology provides a feasible technical route. This system integrates functions such as device 3D display, ledger information query, virtual inspection, and skill training. It can effectively solve the problems of difficult identification of underground passage lines, incomplete acquisition of equipment information, non real-time acquisition of equipment operation data, low efficiency of operation and maintenance data management, and insufficient intuitive inspection and maintenance. It will significantly improve the efficiency of digital operation and maintenance of power cables and channels.