Abstract: Based on the detailed study of the model and storage data of the PSCAD and ADPSS simulation software, this paper presents a model conversion method based on the analysis of XML file data.The proposed method realizes the bidirectional automatic conversion of large-scale electromagnetic transient model between PSCAD and ADPSS, which uses the C++language to write the conversion program on the Microsoft visual studio platform, and uses the Libxml2 function library to analyze the data accurately and efficiently.The validity of the conversion program is verified by GIGRE standard example.The simulation results show that the system topology and dynamic characteristics can be consistent, and the error can be controlled within 2%, thus validating the practicability and accuracy of the model conversion method.