Abstract: The influence of spudcan penetration of wind turbine installation vessel in sandy soil on adjacent bucket foundation was investigated by physical model tests and finite element method. Firstly,the physical model tests were conducted to verify the rationality of the finite element model,and it was preliminarily determined that the influence area of spudcan penetration in sandy soil was roughly2.5 times the diameter of the spudcan. Based on the finite element CEL method,the influence of the ratio of the distance between the spudcan and the bucket foundation to the diameter of the spudcan（S/D）on the in-situ stability of the bucket foundation is further studied. The results show that the inclination rate,the maximum vertical displacement and the stress on the bucket wall of the bucket foundation gradually decrease with the increase of S/D. During the spudcan penetration process,the stress on the bucket skirt and the compartment plate at the side near the spudcan is much greater than that at the side away from the spudcan,and the earth pressure at the top of the bucket foundation is much smaller than that at the bottom of the bucket foundation.