Composition and scale: The elevation shows the overall appearance of the building facade, including height, width, and level, with accurate scale and composition. Material and color: The elevation shows the material (such as glass curtain wall, stone, paint, etc.) and color matching of the external facade of the building in detail by marking lines, shadows and colors, reflecting the style and taste of the building. Decorative elements: decorative elements on the elevation (such as relief, lines, patterns, etc.) not only enrich the visual effect of the building, but also convey the cultural connotation and artistic style of the building.