In　this　paper,　two　kinds　of　frequency　selective　fabrics　(FSFs)　with　the　periodic　structure　separately　made　of　U-shaped　velvet　and　looped　pile,　the　stainless　steel　blended　yam　as　the　conductive　unit　material,　were　prepared.　The　transmission　coefficient　and　reflection　coefficient　of　specimens　were　tested　and　the　experiment　results　were　analyzed　to　explore　the　differences　in　frequency　response　characteristics　of　FSFs.　With　the　same　size,　the　resonance　frequencies　of　the　U-shaped　velvet　and　looped　pile　samples　are　close,　but　the　resonance　peak　value　of　the　latter　is　smaller　than　the　former.　An　increase　of　the　unit　length　leads　to　resonance　frequencies　of　two　kinds　of　specimens　moving　to　the　lower　and　then　being　stable.　When　the　basic　structure　spacing　b　increases,　the　resonance　peak　value　of　looped　pile　sample　becomes　smaller,　and　that　of　U-shaped　velvet　sample　becomes　larger.　The　looped　pile　sample　with　cube　unit　has　more　abundant　and　stable　frequency　response　characteristics　because　of　its　regular　unit　shape　and　good　connectivity　between　looped　piles.　Although　a　lot　of　researches　need　to　be　done　on　looped　pile　FSFs,　this　paper　contributes　to　future　research.