To meet the continuous deepening of the digital application requirements for the entire life cycle of water transportation engineering during the 14 th Five Year Plan period,aiming at the current lack of corresponding standards and accurate modeling methods in BIM design for mountain opening and slope protection in large-scale port engineering,based on a project in Ningbo.this paper sorts out the BIM specifications and standards in related fields and industries,and compiles the BIM information model construction rules for the formation of land areas of large-scale port projects and slope protection.Problems such as boundary processing,model optimization,data penetration,information deepening,and data transfer are solved through the flexible choice of Autodesk software and secondary development technology.A systematic and standardized BIM design and application method for mountain opening and slope protection in land area formation is studied.The results show that the method not only greatly improves design efficiency and achieves 3D visualization,but also makes up for the lack of BIM design applications for mountain opening and slope protection in large-scale port engineering,which provides ideas for digital information transmission at different stages of large-scale port engineering.