Deep soft soil lies under the substratum of a ship lock，where the geological conditions are complex，and the excavation depth of the ship lock foundation pit is large.In order to meet the deformation requirements of the supporting structure and the surrounding environment and ensure the economy and safety of the ship lock construction，it is proposed to add two prefabricated steel supports into the double-row pile supporting scheme.This paper focuses on the combined support of prefabricated steel supports and double-row piles and uses the finite element software，namely GTS-NX to simulate the construction process of the deep foundation pit of the ship lock.The monitoring data and finite element analysis results show that the horizontal displacement characteristics of the supporting structure featuring prefabricated steel supports and double-row piles and the settlement characteristics of surrounding buildings are basically consistent with the measured results of the project.Steel support can effectively limit the horizontal displacement of the supporting structure and reduce the impact of pit excavation on the surrounding environment.Therefore，it is feasible to use prefabricated H-shaped steel supports to reinforce deep foundation pits in soft soil.