Steady　increase　and　low　emission　requirements　for　vehicle,　initiated　material　company　develop　new　test　equipment　for　their　small　lighter　material.　In　this　paper,　a　new　test　rig　from　DuPont　China　is　investigated　using　Boundary　Element　Method　(BEM)　method;　Based　on　this　numerical　simulated　test　rig,　one　kind　of　DuPont　new　light　PET　material　Insertion　Loss　(IL)　performance　is　also　investigated　with　this　numerical　test　rig　model;　Comparing　with　the　test　data　provided　from　DuPont　China,　the　numerical　analysis　results　show　that　the　test　rig　and　PET　material　insertion　loss　can　effectively　and　accurately　simulated.　The　authors　also　present　details　related　to　test　rig　numerical　modeling　and　errors.