In view of the problem of the determination of the length of the full straight positioning pile and the bearing capacity of the foundation of the floating yacht wharf in Oujiang Port area,Wenzhou,under the geological condition of nearly 35 m muddy soil,the three-dimensional full-scale numerical simulation analysis and the verification of the bearing capacity of the foundation of the wharf structure with different positioning pile length are carried out by using the numerical simulation method under the action of wave force and flow force.The internal force distribution characteristics of shear force and moment,the maximum displacement of pile top and the maximum stress of pile body change with different pile length are obtained.The research shows that for similar projects,the control method based on bearing capacity of foundation and displacement of pile top as the main method,and pile shaft stress control as the auxiliary method can be used to determine piles length.