Recently, with the improving domestic residential living standard, increasing numbers of architectural designers are pursuing the arc structural mode to make the building stand out of the background. However, for the construction of the variably curved steel pipes in such curved buildings, its construction quality, constructive efficiency and visual quality are all problems widely concerned by the industry units. With the rapid promotion and popularity of the BIM industry, by utilizing the BIM and Internet technology, we summarizes a set of the variably curved steel pipe construction workshop of prefabricating off-site and code-based fast positioning and assembling on-site, which is well-performed in positioning, molding, construction quality, efficiency improving and construction cost reduction. The construction workshop is especially suitable for the construction of buildings with complex appearance style, pipelines restricted by the building shape, or curved pipes with nominal diameter under 20mm. Applications in related construction projects has proven that the workshop is efficient and economically benefit.