Abstract: Accompanied by the accelerating pace of infrastructure construction and the continuous improvement of the quality requirements of engineering construction, the accuracy of landslide engineering survey also puts forward higher requirements, this paper takes a project on the right bank of the Yangtze River in Liangjiang New Area of Chongqing Municipality as an example, and adopts the geological fine investigation method based on the realistic 3D and GIM technology, realizing a breakthrough of the application technology of three-dimensional fine survey of landslide engineering in the mountainous city, which provides support for the emergency disposal of landslide and the implementation of engineering. The results show that:① Based on the real-life 3D model realized the interpretation of the key elements of landslide geohazards, which provides a powerful auxiliary decision-making and basis for geohazard investigation; ② Through the 3D geologic modeling method with GIM technology as the core, the construction of a refined 3D geologic information model of the study area is realized, which has the characteristics of rapidity, accuracy, and reliability; ③ Through the integrated integration and fusion application of the real-life 3D model and GIM technology, the survey results are more refined, providing effective data support and scientific decision-making for the emergency disposal of landslides and the implementation of he project.

Key words: realistic 3D, GIM technology, 3D geologic modeling, landslides, geologic hazards