For the hydraulic structures of wharf node composed of the 2.2 m-diameter pile filled with reinforced concrete and the 1.5 m-diameter vertical and horizontal of ties for hollow tubes, based on secondary development and parallel algorithm of large general finite element software Abaqus, we establish a 3D numerical model of wharf considering the nodes local refinement. According to the comparison and verification of spot test and numerical analysis of large variation of parameter, we get the nodes’ mechanical behavior of the core reinforced concrete pile stress, the outer steel casing stress, the vertical and horizontal ties stress, the tensile force of reinforcing and the failure mode, and analyze the working condition of nodes of the most unfavorable load combination. According to the mechanical behavior of the nodes and the principle of “Strong Connection & Weak Components” , we optimize the design on nodes.