Abstract: The calculation of the earth pressure under the action of wind and wave loads is the key to analyze the stability of the offshore bucket foundation structure.When the bucket foundation structure rotates, the displacement model is more complicated than that of the retaining wall, both the rotation angle and the rotation center are important factors affecting the earth pressure distribution on the bucket wall.The earth pressure distribution characteristics of different rotation centers of the bucket foundation are analyzed in this study, and it is found that when the rotation center is in the bucket, the earth pressure at the same side of the bucket may have both quasi active and quasi passive regions, and with nonlinear distribution.Based on the earth pressure theory considering displacement effect, an earth pressure calculation method suitable for different rotation modes of the bucket foundation is proposed, and the formulas for calculating the longitudinal and circumferential earth pressures are obtained.By comparing the field test results with the finite element simulation results, it is found that the calculation results are in good agreement with the measured data and the numerical simulation results, which can reflect the circumferential earth pressure distribution characteristics.The research results are of theoretical significance to the stability study of the offshore bucket foundation.