Abstract: Arch bridge of diagonal-span located on Hefei XinQiao-Airport Expressway is medium-supporting single-across with steel-mixed composite-structure whose span is 68 meters long.The tough of design and manufacture in this project was to control the angels of beams and arch slings'anchor boxes.The key technology of beams and arches manufacturing would be mainly described, and the use of BIM to solve the difficult problems in further design of slings' anchor boxes would be shown as well.