Abstract: A high-precision slope modeling method of "classification parameterization collaborative control" has been developed to address the three major technical bottlenecks in BIM modeling of highway slopes: poor 3D visualization effect, insufficient model accuracy, and difficulty in adapting to engineering changes through parameter solidification. This method aims to improve the efficiency and accuracy of slope modeling. This study aims to improve the visualization, accuracy, and applicability of 3D slope models by establishing a slope grading system, developing a parameterized slope family library, and using hollow family shear technology. This method has been successfully applied in slope modeling of a certain highway project. By constructing a systematic solution that integrates parametric design and Revit platform features, the modeling challenge of a 7-level high slope has been successfully addressed. The model can dynamically adapt to complex geological conditions, with a deviation rate of less than 3% from on-site measured data. This study effectively broke through the technical bottleneck of BIM modeling for highway slopes and formed a reusable parametric modeling system. This method not only improves the visualization effect and accuracy of the 3D slope model, but also enhances the applicability of the model, providing a reliable technical path for BIM application throughout the entire lifecycle of highway engineering.