Abstract: With the development of Energy Internet, the reliability of power communication network is required more and more. The accuracy of fiber fault point becomes an important index of communication monitoring. In order to solve the problem of high security and high operation cost of dedicated optical fiber on-line location network, this paper proposes a fault location technology based on the fusion of communication network and location network, through the coupling of the positioning terminal equipment and the edge equipment of the electric power communication network, the transmission of the control and positioning information is realized, in order to save the construction cost of the special location network and improve the carrying capacity of the power communication network, it is necessary to ensure the safe and stable operation of the power system.