This　work　is　intended　to　further　lower　and　broaden　the　band　gap　for　flexural　waves　by　means　of　a　meta-beam　exploiting　nonlinear　resonator＇s　concepts.　For　this　purpose,　the　beam　structure　is　periodically　attached　with　a　nonlinear　resonator.　The　proposed　nonlinear　resonator　is　developed　by　parallelly　adding　a　negative　stiffness　(NS)　corrector　to　linear　elastic　component.　The　NS　corrector,　which　is　formed　by　curved　Euler　buckled　beams,　can　provide　negatives　stiffness　and　counteract　the　linear　one　at　the　equilibrium　position　in　order　to　lower　the　dynamic　stiffness　the　resonator,　without　sacrificing　the　support　capacity.　The　theoretical　model　of　such　resonator　is　established　firstly,　and　the　reaction　force　and　stiffness　are　calculated.　After　analyzing　the　sensitivity,　a　designing　procedure　for　the　NS　is　proposed.　Finally,　the　theoretical　model　of　the　metastructure　beam　with　NS　resonators　add-one　is　established　and　band　gap　structures　are　predicted　using　the　Wave　Finite　Element　Method　(WFEM).　©　2020　Proceedings　of　ISMA　2020　-　International　Conference　on　Noise　and　Vibration　Engineering　and　USD　2020　-　International　Conference　on　Uncertainty　in　Structural　Dynamics.　All　rights　reserved.