Based on a dredged harbor basin project,this paper introduced the design and key construction technologies about the over-length steel tube-sheet pile wall in the integral deep-water unloading sheet-pile structure.According to the auxiliary pile’s ability to adapt to the deformation,the requirement that the allowable deviation of main pile’s verticality is no more than 0.4% was put forward.Through rational design and transformation to the guide frame,the pile-sinking technologies such as whole-pile lifting,vibrating-driving combination,and staggered sinking were adopted to ensure that the piles sink smoothly.The results show that all the steel tube-sheet pile walls achieve the design elevation and have a good pipe sinking effect.It can provide a technical reference for similar projects.