Abstract: Aiming at the phenomena of inconsistent virtual terminals and irregular virtual circuits in SCD files, this paper proposes an SCD file anomaly pattern recognition technology based on a logical rule engine. In this paper, by establishing a logical rule engine consisting of a device identification library, a manufacturer"s ICD logic library, a standard device rule library, and a typical circuit rule library, the SCD file is parsed to automatically identify device information, version information, virtual terminals, and virtual circuits, and the manufacturer"s ICD logic files are reversely generated. Utilizing the correlation between IEDs, ICD logic files, and standard devices, the recognition of abnormal patterns in SCD files by the typical circuit library is realized. Through the application of cases, the ability to troubleshoot secondary circuit errors, omissions, redundancies, and virtual terminal anomalies is improved, the workload of manual verification is reduced, and the on-site work efficiency and quality are effectively enhanced.