Reconstruction of the Environmental Narrative of Water Margin Based on UE5: The Design of the Classic Literary Scene of the Temple of the Wind and Snow Mountain. This design is based on Unreal Engine 5, the "Water Margin" in the classic scene "Snow Mountain Temple" digital reconstruction. Combined with Lumen global lighting, Nanite virtual geometry and weather plug-in, it dynamically simulates the quiet, heavy atmosphere and dilapidated mountain temple, using Quixel high-precision assets to build scenes while integrating oriental aesthetics and modern light and shadow. The design process covers text analysis, original painting, white box construction and asset optimization, and finally builds high-precision three-dimensional scenes, breaking through the time and space limitations of traditional texts, activating young people's interest in classical literature with immersive exploration and dynamic environmental narration, providing an innovative path of "technological culture" for the digital inheritance of cultural heritage, and helping the value regeneration and global dissemination of traditional culture in the digital age.