Abstract:Based on the earth pressure acting on piles,the retaining piles used in the deep foundation excavation can be divided into three types. They are shallow embedded piles,cantilever piles,deep embedded piles. There is only one solution in shallow embedded piles or cantilever,but many solutions in deep embedded piles. It¢s completely possible to select an optimal scheme in the design of deep embedded piles according to special condition. By analyzing a deep foundation excavation case,the significance of multiple solutions of deep embedded piles in the design of deep excavations is explained.