The curtain wall is a type of exterior wall enclosure of the building, a lightweight wall with decorative effect on the exterior wall using materials such as glass, stone and aluminum sheet. It is not a load bearing wall, and like a curtain hanging on the exterior wall of the building, so called the hanging curtain wall as well. It is composed of aluminum alloy structural frame and mosaic sheet, has features of waterproof, lighting, ventilation and heat insulation.