The study focuses on the application of 3D geological modeling based on BIM technology in the environmental dredging project，which has higher requirements on engineering digitization and design refinement，to change and upgrade the design approach effectively. Relying on the pilot project practice of endogenous pollution treatment for the Baiyangdian lake in Xiongan New Area，we carry out the three-dimensional forward design of geology using MR-Geo software developed based on the MicroStation platform. A geological model with attribute information of soil is created，with which the applications in the scheme comparison of dredging，drawing output，sectioning analysis of dredging model，and process simulation are realized. The value for the improvement of design quality and efficiency using BIM technology in environmental dredging projects is embodied，which provides a reference for the dredging engineering industry to further promote the application of BIM technology.