Three-dimensional model of the buildings realistically shows the various components of architectural form，and give us a more intuitive perception.Taking Chatanbei hydraulic engineering of Taihe County as an example，after completing the collection of feature data，the three-dimensional model of Chatanbei hydraulic engineering was established by comprehensively using AutoCAD drawing function and the perfect 3D model construction technology of 3D Max.This three-dimensional model was imported into Lumion for rendering and achieving 3D animation roaming.The three-dimensional model constructed in this paper would lay a foundation for the propaganda and digital protection of water conservancy heritage.