Abstract: This article summarizes the design experience of a substation in the shield section of an underground tunnel, and introduces the design optimization and construction and installation of the main electrical equipment in the substation, combined with the actual project. At the same time, this article discusses related issues in the design of the substation in the shield section of the underground tunnel, which provides suggestions for deepening and perfecting the design of similar projects, and provides a reference for the construction and equipment installation of the substation in the shield section.