Abstract: To overcome the difficulty for the electromagnetic compatibility (EMC) modeling technology of the complex vehicle structures, this article proposed a multisoftware vehicle level cosimulation technology. With the finite element software HyperMesh to simplify and mesh the complex CATIA model of a vehicle,develope Matlab program for extracting the grid data, and edit program in Matlab to build grid model, then import the vehicle grid to electromagnetic simulation software FEKO to obtain the desire accuracy vehicle level EMC model. Finally, the vehicle level antenna electromagnetic radiated emission model of a certain type automobile is established , the radiated electric field strength modeling and simulation results verify the effectiveness of the method.