Nowadays, it is more and more popular to apply the spiral stair in the public areas, as well as at home, especially themarble stair, but the processing of spiral stair is very difficult. Stylist should give full consideration to design more scientific and accuracy, it is also necessary for them to consider the announcements that the stair design in daily life.
1.  Practical applicability, it is mainly convenient to walk, such as the step height of the stair, which will directly influence the walking convenience in the proportion between the steps.
2,  Decoration, apart from the walking, the spiral stair also have the adornment effect, the design of stair is also directly can foil the surrounding environment)
3,  Geomancy, everyone has reached a certain satisfaction nowadays, but it is not enough on spiritual, and the geomancy is the pillar of everybody in the spirit.