The double-row piles which have the advantages of convenient construction,good mechanical behavior,small deformation,and are widely used in the various types of temporary and permanent projects.This paper takes the upgrading project of high-slope waterway from level three to level two as an example,performs finite element analysis on the double-row piles based on the construction process,and then explores the reasonable pile length and pile spacing,hereby analyzes the changes in displacement and bending moment of double-row piles during the excavation process of the waterway.The calculation results show that 1) The growth of pile length will significantly reduce the maximum horizontal displacement of double-row piles,but has little effect on the maximum positive and negative bending moments of double-row piles.2) The growth of pile spacing will slightly increase the maximum horizontal displacement of double-row piles,but significantly increases the maximum positive and negative bending moments of double-row piles.3) Taking into account a variety of factors such as structural displacement,structural stress and construction cost,the pile length of front and rear piles is equally determined to be 22.0 m,and the pile spacing of front and rear piles is determined to be 1.0 m and 3.0 m,respectively.4) As the excavation depth increases,the maximum horizontal displacement and maximum positive and negative bending moments of front and rear piles significantly increases.