Abstract: Logical model is the key to realize the integration of information and physics. At present, most of them focus on concepts, and less on the research of digital structure construction and three-dimensional physical model association to build digital twin modeling application scenarios. For the substation logical model, by describing the different physical capabilities expressed, this paper proposes the overall framework, technical model structure, element composition, coding form and other structural design of the logical model, and develops the twin modeling application scenario of the logical model based on the specific project, carries out the integration and association of the logical model and the three-dimensional physical model based on the digital coding association method of the logical model digital platform, realizes the twin modeling application oriented to the expression of multiple information in the design process, provides the basis for the bidirectional data connection between the physical entity data and the virtual model in the subsequent substation.