To relocate the spancrete slab factory in Harbin, the major structural members retrofitted have been removed to a new factory. All of members including the columns, crane beam, precast beam, vertical and horizontal braces are used in new factory after detecting and identifying. The columns were increased 1.8 m by plant rebar and enlarging cross-section, and erected in new isolated footings. Other members, such as, crane beams, roof beams and braces were connected with columns. The double Tee slabs with and without rectangular holes were arranged by regular intermission on the roof beams. The safety and economy may be insured after forming the bent frames, meanwhile, the day lighting is improved.