EcoatMaster simulation software was used to numerically simulate the electrophoretic state of a MPV vehicle.Firstly,through comparative analysis with the real car,the factors affecting the coincidence between the macro calculation and the real car are obtained.Based on the analysis of holes,pore size,hole's spacing and perforation of the unelectrophoretic region,suggestions for structural optimization are put forward.Finally,combined with the results of real vehicle anatomy,it is shown that electrophoretic simulation plays a good guiding role in structural optimization design.