Combining with a reconstruction project of bulk cargo berth in a port area in China,this paper studies a new steel tubular-sheet pile structure produced by restructuring the high-pile wharf by a numerical analysis.A comparison between the numerical computing results and the theoretical results of a conventional type of sheet-pile wharf under earth pressure is made firstly to verify the accuracy of this numerical method.Then by choosing different 3D models which are built to study the soil boundaries,the influence on the wharf structural stress with respect to soil boundaries is analyzed.Finally,a 3D numerical simulation on the structure which is under the operating load is carried out to analyze the stress and displacement of the structure.It is discovered by numerical simulation and theoretical analysis that the boundary effect of soil can be neglected when the soil boundary reaches 60~80 m in this 3D numerical model.In addition,under the structural surface load,the earth pressure and the horizontal displacement produced by earth pressure of the new structure are less than those of the conventional sheet-pile wharf structure.