With the development of computer graphics technology, the application of 3D visualization simulation technology has become increasingly widespread. This paper develops a three-dimensional visualization simulation system for water bodies by studying the general model of regional landscape space and water quality purification. This paper mainly does research on rapid dynamic rendering and modeling technology of water landscape based on 3D image technology and uses the 3ds Max Material Editor to map the enhanced 3D landscape design to complete the design, and the designed landscape feature data will be saved in the system data statistics unit for later query. This article also expounds the entire process of alternative simulation construction and confirms the feasibility and superiority of alternative modeling methods through multiple case comparisons. Alternative modeling methods are used as the main way to construct waterfall scenes, that is, simple models are combined with texture mapping, particle effects, and other forms to replace complex models, while ensuring the simulation effect, and the complex models are presented in the most simplified way to make the virtual scene. It is well performed in terms of authenticity and real time. The research results show that the designed system design renderings are extremely clear and of good quality; they have a high score in the water landscape design. Moreover, the system application cost is low, energy consumption is low, and operation efficiency is high.