Abstract: Used as the lateral retaining structure during the regular service stage considering the combination of support piles and basement external walls, the technique of the unity of support piles and basement external walls can reduce the thickness of basement external walls and the excavation area, so it has good economic and social performances by saving the project cost. Through project application, the waterproof design and the load transfer slab are considered, and the strength and durability design are calculated under various conditions of excavation stage, regular service stage and earthquake stage. These outcomes can be referenced in future other similar projects.