Abstract: To address the stringent deformation control requirements faced by nearby subway deep excavation projects, it is necessary to study the key technologies in their design and construction to ensure the safety of subway structures and smooth progress of construction.Taking the deep foundation pit project of the Snowflake Brewery adjacent to the metro as an example, this paper analyzes the support design strategies, including the reserved soil platform basin excavation and the local pile-brace composite system, the reinforcement of the waterproof curtain design, and the collaborative support optimization plan; it also studies the layer-by-layer and section-by-section excavation technology, the vibration control of construction machinery, the emergency rescue plan, and the multi-dimensional monitoring feedback mechanism. Combining theoretical analysis with on-site measured data, the key technology achievements are summarized. The results show that the adopted support design effectively reduces the deformation risk of the foundation pit, and the key construction technologies significantly reduce the degree of disturbance to metro facilities. The monitoring data show that the horizontal and vertical deformations of the metro structure do not exceed the limit values specified in the code, and the project is safe and stable. This paper summarizes a set of integrated design and construction technology paradigms suitable for deep foundation pit projects adjacent to metro lines, covering deformation control, risk management, and information-based monitoring, providing theoretical basis and practical reference for similar projects.