Sodium　metal　is　regarded　as　one　of　the　most　prospective　next-generation　anodes　material　owing　to　its　high　theoretical　capacity,　low　redox　potential,　low　cost,　and　natural　abundance.　Its　most　notable　problem　is　the　dendrite　growth　during　Na　plating/striping,　which　causes　not　only　the　safety　concern　but　also　the　generation　of　inactive　Na.　Here,　it　is　demonstrated　that　2D　carbon　nanosheets　embedded　by　bismuth　nanoparticles　(NPs)　(denoted　as　Bi　subset　of　CNs)　serve　as　a　robust　nucleation　buffer　layer　to　endow　the　sodium　metal　anodes　(SMAs)　with　high　Coulombic　efficiencies　(CEs)　and　dendrite-free　deposition　during　long-term　cycling.　The　embedded　Bi　nanoparticles　significantly　reduce　the　nucleation　barrier　through　the　＂sodiophilic＂　Na-Bi　alloy.　Meanwhile,　the　carbon　frameworks　effectively　circumvent　the　gradual　failure　of　those　Na-Bi　nucleation　sites.　As　a　result,　the　metallic　Na　on　the　Bi　subset　of　CNs　nucleation　layer　is　repeatedly　plated/stripped　for　nearly　7700　h　(1287　cycles)　at　3　mA　h　cm(-2)　with　an　average　CE　of　99.92%.　Moreover,　the　Na||Na　symmetric　cells　with　the　Bi　subset　of　CNs　buffer　layer　are　stably　plated/stripped　for　4000　h　at　1　mA　cm(-2)　and　1　mA　h　cm(-2).　It　is　found　that　the　cycling　stability　is　closely　related　to　the　Na　utilization　of　SMAs　and　current　rate.