The balustrade is the safety facility of bridge and building, which plays the role of separating and guiding. It makes the boundary of the divided area clear and clear. The designed balustrade is of great decorative significance.

Generally, the height of low hurdles is 0.2-0.3 meters, that of middle hurdles is 0.8-0.9 meters and that of high hurdles is 1.1-1.3 meters. The moment between railings is usually 0.5-2 meters. From the formal point of view, the railings can be divided into two types: intersection type and continuous type. The former consists of pillars, handrails and crossbars, which are supported on the pillars; the latter has continuous handrails, which are composed of handrails, railings and bases.