Abstract: The concrete bucket foundation structure is a new structure with high efficiency, energy saving, green environmental protection, which has been widely used in the construction of breakwater. The steel-bucket foundation with muti-bay is further improved on basis of this structure, which is a new solution for the construction of breakwater and revetment in the muddy sea areas of China. The in-situ tests on the steel bucket are carried out through offshore structure measurement. The viariation rules of structural displacement, dip angle, air pressure and wall strain in the process of negative-pressure sinking and air-inflation lifting are obtained and the efficient operation mode for water pumping and air pumping is provided. The hoop stress of the bucket wall is greater than the longitudinal stress, and the compressive stress is more likely to appear near the bottom, and the tensile stress is easy to appear near the top. The results may provide support for the further optimization of the structures.