Abstract: Dome roof is favored by designers all over the world because of its reasonable structural stress and smooth appearance. It is mostly used in industrial and civil buildings. However, compared with plane formwork, dome formwork has a three-dimensional change in space, so how to accurately determine the position and ensure the forming rules of arc surface formwork is the difficulty of dome formwork. Taking the roof formwork of the control tower dome of Mwanza airport as an example, this paper mainly introduces the formwork technology of the dome roof. In order to solve the problem of supporting formwork for the arcshaped bottom plate of the dome, CAD software was used to pick up the key data of arc length, diameter, height and radius of the dome in the electronic drawing. The arc rib was set out according to the corresponding size on the spot to assist the dome shaping. The arc rib was filled and fixed in different regions, and the short square timber and steel pipe frame were used as the support system under the formwork. The practice shows that this method has the advantages of simple operation, fast construction speed and good concrete forming effect.