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Any reservoir construction layout involves the collection and interpretation of large amounts of geographic and other data. Because the traditional methods to analyze reservoir construction layout are not efficient and intuitive, visual simulation is the key to improve the design efficiency and management of the project. In this paper, triangulated irregular network (TIN) is used to help to establish the digital terrain model. The different entity models were established with different methods. The models were matched to show the actual terrain based on 3DS MAX mapping. Gongming reservoir in South China is taken as a case study. The finished scene was visualized in three-dimensional animation, providing a scientific, effective and visual analyzing method for the management and decision-making associated with the project.