Abstract: In order to obtain the relationship between the temperature change displacement of gas insulated metal-enclosed switch (GIS) barrel and its key components, and to improve the level of GIS operation and maintenance technology, we carried out a simulation study on temperature change behavior of key components of GIS Barrel based on digital twin model. A reconstruction method of GIS digital twin model based on real scene point cloud data is proposed, and four typical fault conditions are established abstractly. Moreover, the method of parameter selection and grid division of GIS temperature change behavior simulation based on ABAQUS software is given. The typical fault case simulation study is carried out based on 220 kV GIS data of a substation. The case simulation results show that the key components that affect the temperature dependent displacement behavior of GIS barrel are bus barrel, support leg, basin insulator and bellows. The stress bearing limit of basin insulator, support leg, and bellows should be considered comprehensively in the risk assessment of GIS equipment temperature change displacement. The compensation ability of bellows is greatly affected by the bending shape of sliding support leg and bus barrel. The axial displacement variation of bellows can be used as a sensitive parameter to characterize the temperature dependent displacement behavior of GIS equipment, which should be paid more attention to in engineering. The research results can provide engineering guidance for the overhaul and maintenance of GIS equipment.