Abstract: Based on the finite element software SYSWELD, the local and global simulations of hot wire filling laser welding for the coil box of SCC correction field was carried out by using inherent strain method. In the local simulation, three welding schemes that only change the order of the welding layers were designed for simulation; in the global simulation, three welding schemes were designed with two welding seams on the front and back using different segmented welding sequences for simulation. The results show that the calculated value of inherent strain is in good agreement with the measured value. The maximum deformation of each scheme in local simulation is 1.06 mm and 1.35 mm and 1.47 mm, respectively, while the maximum deformation in z direction of each scheme in global simulation is 3.06 mm and 5.60 mm and 5.39 mm, respectively.From the comprehensive consideration of reducing welding deformation and improving efficiency i.e. reducing the number of turnover, the most reasonable welding plan for the coil box is to flip over every two layers after welding, except for the first and last layers. When welding in sections, first weld four corners, and then alternately weld the middle section diagonally and symmetrically.