Abstract: Considering the fluid-soil coupling effect among a group of deep foundation pits and using the Shenzhen Metro line 5 as an example, a numerical simulation of the fluid-solid coupling of a group of foundation pits in soft soil was carried out. The results show that: (1) A higher underground water level results in greater deformation of the foundation pits, with an exponential relationship between the underground water level and the maximum values of both surface subsidence and bottom heave, and a linear relationship between maximum horizontal displacement of the fender pile and underground water level; (2) Existing station have a reinforcing effect on the soil body of new foundation pits at the side of the station, which decreases the soil deformation at the side closest to the station and increases it on the other side; (3) Regarding the numerical analysis considering the fluid-solid coupling action of foundation pits, the simulation complies with practical experience.