In view of the problem of difficulty in version management due to frequent changes in the intelligent substation configuration description language(SCL),comparison method for SCL configuration file is proposed.According to IEC 61850-6,the key and criterion are defined for crucial SCL elements,forming a two-dimensional table structure with a primary key.The differences between the SCL files in structure,elements and attributes can be quickly found using the method of recycling,sorting and cross comparison,based on which,the SCL comparer is developed.