Roller blind is one of the window decoration products. It is a blind fabric that is processed and rolled into a roller shape. The method of using a rope or a chain to rise and fall has many advantages such as beautiful appearance, simple structure, stable and durable etc. Roller blind is suitable for many places, such as business office buildings, hotels, restaurants, offices, households(used as screen blinds), especially for large area glass blind walls. When the roller blind is lowered, the indoor light can be softened and protected from direct sunlight, achieving a good shading effect. When the roller blind is raised, its volume is very small, so that it is not easy to detect.