Abstract: The single-column composite bucket foundation is a new type of offshore wind turbine foundation developed independently in China. This paper takes the single-column composite cylinder foundation for offshore wind power as the research object,and analyses the sinking process of the first single-column composite bucket foundation for offshore wind power by means of field prototype tests,and provides field construction monitoring data. The results show that the single-column composite bucket foundations can be installed and sunk with suction and are highly controllable in terms of levelling,which can provide important reference data for future construction and sinking studies of bucket foundations.