Abstract: A new three-dimensional LS-DYNA program was used to simulate the electromagnetic ring expansion experiment. Some key factors were analyzed for influencing the experimental results: coil winding methods, coil sizes, loading current waveforms, expanding ring widths, and so on. The computed results show that the coil winding method with clearance excels the uniformly winding method. The loading current peaks are approximately linear to the radial velocity peaks of the expanding ring.The movement stability of the expanding ring can be improved by increasing the axial width of the expanding ring section. And the double-coil model can effectively decrease the axial displacement of the expanding ring.