Abstract: Hanging steel coff erdam is a kind of steel coff erdam suspended in water, which is constructed with pile foundation steel retaining tube as force support, and is a kind of measure structure of pile cap in construction water. Taking the construction process of suspension steel coff erdam of Xiaohexi bridge as an example, this paper introduces the structure and construction process of suspension steel coff erdam in detail, which provides a reference for similar construction in the future.