An experimental setup for cold extrusion process with electric-hydraulic chattering was developed and its working principle was introduced.The finite element (FE) model for a kind of cup part (material: 20Cr) was built by using the software Deform-3D.FE simulation experiments with and without electric-hydraulic chattering were carried out to analyze the velocity fields and the metal grid flow lines.The extrusion ex-periments of the cup part were also performed under different conditions.The difference of metal flow lines with and without electric-hydraulic chattering was discussed via a scanning electron microscope (SEM) and the Keyence super-depth three-dimensional microscopic system.The results showed that with the electric-hydraulic chattering, the velocity of material flow increases, whereas deformation resistance decreases.Electric-hydraulic chattering results in easy metal flow, small bending degree of metal flow lines, slender and dense metal grains, and thereby an improved quality of the deformed parts.