Compared with traditional two-dimensional（2D）design，3D BIM design has a better visualization effect and higher design precision. In port engineering design，the software Civil 3D is used to create terrain-related BIM models of earthwork and carry out multi-disciplinary collaborative design on the basis of the Vault platform. This technical solution can achieve the “component-level” management of Civil 3D models，ensure the dynamic association of models among disciplines，improve the efficiency of communication and coordination in the design process，and improve the quality and precision of design results. The Civil 3D collaborative design solution based on the Vault platform can provide a reference for BIM applications in port engineering.