Two　multikyer　electromagnetic　shielding　theories　of　Schelkunoff　and　had　been　studied.　In　order　to　enhance　shielding　effectiveness　(　SE　),　the　synthetic　SE　was　emphasized　and　analyzed　when　an　electromagnetic　wave　of　incidence　enters　two-layer　and　three-layer　composite　shielding　materials.　Moreover,　the　optimal　design　of　shielding　materials　was　investigated　In　this　paper,　a　simple　and　effective　design　of　interlayer　physics　model　was　presented　as　a　guide　to　manufacture　two　types　of　laminated　electromagnetic　shielding　materials　that　were　structural　optimized.