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.