To analyze an excavation engineering adjacent to high-filling surcharge loads, an equivalent stiffness method was applied to calculate the deformation of secant piles which were used as the retaining structure of foundation pit. And only the flexural capacity of reinforced concrete piles was taken into account when the secant piles were considered as the isolation piles. In the second case, the flexural capacity of plain concrete piles was ignored. The in-situ measurements revealed that both stability of the filling soil and safety of the foundation pit were satisfied in the excavation engineering adjacent to the high-filling surcharge load. Secant piles, as a new kind of retaining structure, are suitable for isolating the stress caused by the adjacent overloading, ensuring the stability of landfill soil and the safety of excavation engineering.