The correctness of the virtual loop connection in substation configuration (SCD) files affects the secondary system protection function. The current configuration file is not standardized, its manual verification is not efficient and its result would be influenced by subjective factors and other issues. This paper presents an automatic check method for the intelligent substation virtual circuit based on the intermediate model file. Firstly, a corresponding IMCD file is established for the ICD of each manufacturer's IED, and a standardized model of DOI and DAI is also established according to relevant specifications to solve ICD file nonstandard issues. Then, the KMCD model is constructed through the strictly reviewed SCD file to ensure the correctness of virtual circuit. Finally, the automatic verification of the virtual is realized and the SCD file of a substation is included as an example to verify the feasibility of the proposed method.