The structure of the anchorless steel sheet pile combined with the DCM(Deep Cement Mixing pile)block was used for the construction of small docks.The combined structure took full advantages of the high shear strength of steel sheet pile and the high mass of DCM block,and achieved the purpose of reducing the amount of construction excavation，shortening the construction period,minimizing distractions to the surrounding, and rapidly forming the dock under the silt geological conditions.The combined structure has been successfully used in the design and construction of the bridge pre-casting pier of the CB03 section for the national key project “Hong Kong-Zhuhai-Macao Bridge”,which has proved its applicability and advantages.The combined structure provides a technical reference for the construction of small wharf and the design and selection of supporting structure under the soft soil and even silt geological conditions.At the same time,the design and calculation methods such as the conversion of soil calculation index,the overall and local checking of the structure also have certain popularization value.