Frequency　selective　surfaces　(FSSs)　based　on　textile　or　textile　composite　materials　are　increasingly　becoming　popular　due　to　their　textile　nature　of　high　flexibility,　softness,　low-cost,　easy　fabrication,　and　other　textile　characteristics　compared　to　the　traditional　metal　FSS,　especially　the　two-dimensional　FSS　fabrics.　In　this　study,　a　three-dimensional　(3D)　fabric　periodic　structure　with　conductive　textile　fabricated　vertically　on　the　common　textile　substrate,　forming　a　U-shaped　array,　is　proposed.　An　experimental　validation　has　been　conducted　to　verify　whether　the　3D　frequency　selective　structure　fabric　has　good　frequency　response　characteristics　and　great　design　ability.　The　model　samples　of　3D　periodic　structure　based　on　velvet　fabric　with　different　structure　or　material　parameters　were　fabricated　by　hand.　Through　testing　and　analysis　of　transmission　and　reflection　coefficients　at　2-18　GHz　using　the　shielding　chamber　method,　the　results　show　that　the　velvet　height　of　the　fabric　model　periodic　structure　has　an　obvious　effect　on　the　resonant　frequency.　With　an　increase　in　velvet　height,　the　resonant　peak　will　move　towards　lower　frequency.　With　an　increase　of　vertical　velvet　spacing,　the　resonant　frequency　will　also　move　towards　lower　frequency.　Velvet　material　has　a　slight　influence　on　the　frequency　response　characteristics.　The　frequency　response　characteristics　of　this　structure　are　stable　under　different　incident　angles.　The　3D　periodic　structure　offers　more　design　freedom　and　possibilities.　Significant　effects　of　wave　absorption　or　selective　filtering　by　the　periodic　structure　can　be　achieved　by　regulating　the　structural　parameters　and　material　parameters　together.