Stairs can be divided into single running stairs, double running stairs multi running stairs according to the flight. The plane shape of the run is straight, broken, curved.

Single running stairs are the most simple, suitable for buildings with lower storey height; double running stairs are the most common, including double running straight up, double running zigzag, double running half fold (parallel), etc., which are suitable for general civil industrial buildings; three running stairs are three fold, T-shaped, open close, etc., which are mostly used in public buildings.

The scissor stair system is composed of a pair of parallel running stairs with opposite directions, a pair of overlapping unconnected single running straight climbing stairs with cross-section in scissor shape, which can pass more people save space at the same time.

Spiral staircase is supported on the middle column with fan-shaped steps. Although it is comfortable to walk, it saves space is suitable for places with less flow of people less frequent use. Circular, semi-circular arc-shaped stairs are supported by curved beams curved plates. The steps are slightly fan-shaped, diversified, lively decorative, which are suitable for public buildings.