In view of the influence of different excavation methods on pile foundations of adjacent bridges，two different excavation schemes are determined by using finite element modeling analysis method for a second-lane ship lock project：Scheme 1 is excavation using a three-level slope with a larger average gradient，while Scheme 2 is excavation using a four-level slope with a smaller gradient. The influence of two kinds of excavation methods on the horizontal displacement，tensile stress，and bending moment of the bridge beam pile is calculated and analyzed. The results show that the steeper the average slope is，the greater the displacement is，the greater the tensile stress reaches its peak value at the excavation point of 16 m，and the bending moment value of Scheme 2 is far less than that of Scheme 1. The research results have improved the research in the field of complex lock foundation pit construction and are of great significance for future engineering design and research in this field.