IEC 60870 standards series is extensively applied in China. To meet the demands of the conformance test

the instructive document DL/Z634.56—2004 for conformance test is issued. Based on the DL/T 667—1999 conformance test procedure of DL/Z 634.56—2004

a systematic tool used for conformance test is designed and realized. The dynamic model

software structure and test surroundings of the tool are described in detail. The systematic tool is capable of performing the auto-judgment of protocols

auto-decoding and auto-accomplishment of conformance test to the limit. Its high dependability and efficiency has been verified in its application in actual test

providing an effective way to carry out substation conformance test according to DL/T667—1999.