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In view of the management difficulty and high cost caused by manual inspection of low-voltage distribution network topology, this paper compares the Pearson correlation coefficient and gray correlation analysis in the time domain and frequency domain, and proposes a practical distribution line Topology anomaly inspection method. This method uses the distribution data obtained from the data acquisition and monitoring system and the power information acquisition system, uses the Pearson correlation coefficient to judge the similarity of the user voltage sequence curve, and uses the gray correlation method to analyze the user sample set , The voltage change of the intermediate node determined the abnormal position of the downstream node, and the user with the wrong station identification was found. According to the experimental verification results, compared with the gray correlation analysis method, the Pearson correlation coefficient does not have good robustness and will increase the number of misjudgments. The gray correlation analysis method of frequency domain similarity is used to obtain the distribution line topology verification The accuracy rate reaches 99.9%, which is very applicable and reliable.