Sheet-pile dock wall is widely used in dock design at soft soil area because of its economy,but there are some problems,such as excessive displacement of front wall,unclear displacement limit,calculation results are not adapted to the actual situation.This paper takes a sheet-pile dock wall of an overseas project as an example,uses PLAXIS software to carry out numerical simulation calculation combining with the construction process and structural characteristics of the dock wall,and compare with the actual measured data.Then the paper carris out the structural calculation under different working conditions on the basis of optimization model,and deduces rules of structural displacement and internal force change.The results show that the hardening soil model is more accurate to calculate the structure of sheet-pile dock wall in ultra-deep soft soil area.Among the soil parameters of hardening soil model,the secant modulus E50 is the most sensitive.When there is no test data,E50 is recommended as 2~2.5 times SPT blow count,unloading-reloading modulus Eur is recommended as 3 times E50.Considering the interaction between pile of dock slab and soil in front of the dock wall,the maximum horizontal displacement of the dock wall is reduced by about 30%.The effect of pile foundation of dock slab should be considered when calculating of dock wall.