Natural slate slab, which is concerned as one of the most popular building decoration materials these years, not only has various patterns and colors, but also slippery-resistant, abrasion-proof and durable characteristics. Its art effect gives the urbanites the feeling of primitive simplicity and elegance, as the return of the nature. It is widely used in the floor of the square, park, mall, hotel, living room, bathroom, etc. Furthermore, it can be used in other places according to different demands, such as wall decoration for indoor and outdoor.