As a key part in dock engineering，the cut-off wall is the foundation to make sure that dock can be operated safely against water.The choice of the kind of cut-off wall impacts tremendously the dock quality and project cost.Normal cut-off walls have certain flaws such as high price of the steel sheet pile,many leaks of high-pressure jet grouting pile,etc.So,it is imperative to research and apply new-type curtain walls.This paper describes the first application and construction effect of SMW method cut-off wall used in dock wall and foundation pit of dock head,which may serve as reference for similar engineering.