In Chinese traditional roofs, Double-Eave Wudianding and Double-Eave Xieshanding are the top level, and then Single-Eave Wudianding and Single-Eave Xieshanding. The royal palaces and the Buddhism halls generally built in the style of Double-Eaves Wudiading, which is the symbol of superiority.

Four sides of Wudianding are the slopes, generally comprised of one middle ridge and four subsidiary ridges. The surface of the roof has a little radian, so it also is called Siading and Wujiding (Five-Ridge Roof). Wudianding appeared at the earliest time, roughly in the era of pre-Qing Dynasty, and it also was reflected in oracle bone inscriptions, copperwares of Zhou Dynasty and grottoes of North Dynasty. The real evidences are the Quelou Tower and the Foguang Temple of Tang dynasty.

Double-Eave Wudianding is the top-level palace roof in Qing Dynasty. The palace with such kind of roof looks like a rectangle, the surface is wide and the inside is deep. Taihedian(The Hall of Supreme Harmony) is the classic representative of such kind of roof.
 
Single-Eave Wudianding has the structure of the upper side of Double-Eave Wudianding, and it is the standard Five-Ridge Palace. In Forbidden City, Tiren Pavilion and Hongyi Pavilion are the typical representatives of such kind of roof.
 
WudiandingDouble-eave Wudianding roof

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