Abstract: Using ANSYS/LS-DYNA program, the authors analyzed sheet metal electromagnetic forming with the finite element method (FEM), wherein the forming pressure was simplified as sinusoidal pressure, and the pressure along the radial of the sheet metal also changed sinusoidally. Some analysis of the deformation of the isotropic thin sheet under the condition of same pressure amplitude but different loading time was made. The results show that as the loading time increases, the final deformation of the sheet increases first, then decreases, and when the loading time increases to some value, the final deformation of the sheet has little difference. Through studying the relation between loading time and impulse current frequency, the effect of the impulse current frequency on sheet metal deformation height has been achieved: as the frequency decreases, the final deformation of the sheet increases first, then decreases, and when the frequency decreases to a certain value, the final deformation of the sheet has almost no difference.