Abstract: Automatic topology identification is the key factor to carry out lean line loss management, accurate fault location and promote the improvement of intelligent operation and maintenance level in low-voltage substation area.In order to improve the accuracy of low-voltage topology identification, combined with the architecture of distribution internet of things, this paper proposes an automatic topology identification technology based on time synchronization and high-frequency carrier signal attenuation.Taking the station area intelligent fusion terminal as the core, this paper first analyzes the technical basis to realize the topology identification of low-voltage station area, then from the theoretical point of view, the technical principle of automatic identification of station topology is deduced, and the specific steps of topology identification are clarified by taking a typical station topology as an example.Finally, through the pilot application in the stock station area, the physical topology identification from the low-voltage outlet cabinet in the station area to the line side branch box, and then to the user table box is realized, and the topology check of the low-voltage station area is carried out to ensure the accuracy of topology identification.