Abstract: BIM technology, with its powerful 3D modeling and information integration capabilities, has been widely applied in the field of civil engineering. However, there are still certain limitations in the collaborative application of protective engineering design and simulation. To address this issue, it is proposed to develop a plugin based on the Revit platform that integrates 3D geological model construction, support structure model construction, and model data export functions. This plugin utilizes the Kriging algorithm to construct a refined 3D geological model, and implements parameterized intelligent design of support structures through API technology. Then, based on secondary development, the geological model grid is automatically divided and the data format is converted, effectively achieving seamless integration between BIM and numerical analysis. Through practical engineering applications, the results show that the numerical modeling method for slope treatment engineering based on Revit secondary development is convenient and accurate, providing a reliable technical solution for similar projects.