In today's society, special-shaped steel structures have been widely used in factory buildings. The main components of the special steel structure factory building are welded H-shaped steel columns, beams and braces. These members all have welding deformation problems during the manufacturing process. If the welding deformation is not corrected, it will not only affect the overall installation of the structure, but also reduce the safety and reliability of the project. If the deformation caused by the welded steel structure exceeds the allowable deformation range of the technical design, efforts should be made to correct it to meet the product quality requirements.