Construction technique of Dong Minority's wooden-structure buildings is the most excellent form of ethnic and folk traditional culture of Sanjiang County of Guangxi Province, and roofed bridge and drum tower are representatives of Sanjiang Dong Minority's wooden-structure buildings. These buildings not only have beautiful appearance, but also exquisite craftsmanship. In the entire building, mortises are chiseled, and no iron nails are used because all beams, arches and upright posts are mortised into each other. Therefore, it is characterized by firm structure, tight joint, extremely high craftsmanship and high artistic value.

During the period of the Three Kingdoms (AD220 - 280), the Dong ancestors built houses on wood pillars and lived on the upper tier. Such houses were named "Ganlan" (the houses on wood pillars). Gradually, the construction technique of wooden-structure buildings took shape. The complex in Dong Mountain Village is usually composed of drum tower, Sa hall (Ancestral Temple), opera stage, folk residence, grain drying place, grain storage, village gate, pavilion, roofed bridge and performance place before the drum tower. These 10 parts constitute a complete complex in Dong Mountain Village, among which the drum tower, residence buildings, Sa hall and roofed bridge are the most important parts.

The architects are all local craftsmen who are called "Catalpa Carpenters" by Dong people. When designing the drum tower, roofed bridge and folk residence, the only measurement tool is a kind of traditional ruler, called "Carpenter's rod". "Carpenter's rod" is made of a piece of bamboo, and its length is equivalent to that of king post in a house. After flaying the bamboo, the carpenters inscribe the length or dimension of the posts, columns, beams, purlins, square woods and other structural elements of a house on the bamboo with bamboo pen and chisel. Traditional Dong craftsmen also use a set of architectural symbols that are passed down generation by generation. Generally, there are 26 symbols, but only 13 are used frequently. Such Chinese character-like symbols, which are not Chinese characters at all, only make sense to Dong craftsmen, and they are engraved on the "Carpenter's rod" and structural elements.