Abstract: Aiming at the structural safety challenges caused by the asynchronous construction of connecting passages and stations in the interconnected development of commercial plots and rail transit, this study focuses on revealing the deformation and mechanical responses of existing stations and auxiliary structures induced by the construction of connecting passages. Based on the Century Center project as the engineering background, this article employs the Midas GTS NX finite element analysis software to establish a numerical calculation model. It systematically studies the deformation characteristics and stress response patterns of the existing station structure throughout the entire construction process of the connecting passage, which includes the construction of the retaining structure, excavation of the foundation pit, construction of the main structure, and the backfilling of the overburden soil. The research results indicate that by increasing the rigidity of the supporting structure, strictly controlling the depth of layered excavation to be no greater than 2.0 meters, and appropriately increasing the pre-stress of the support, the impact of construction on the existing structure can be effectively reduced, ensuring that its deformation and stress are controlled within safe standards. After adopting the above design measures, the vertical and horizontal displacements of the existing structure are only 0.02 mm and 0.03 mm, respectively, which guarantees structural safety. Continuous dynamic monitoring during construction is recommended. The research results can provide reliable technical support for the design and construction of similar projects in the region.