The　undesirable　Li　dendrite　growth　and　other　knock-on　issues　have　significantly　plagued　the　application　of　Li　metal　anodes　(LMAs).　Herein,　we　report　that　the　synergistic　regulation　of　double　interfaces　adjacent　to　the　metallic　Li　anode　can　effectively　prevent　the　dendritic　Li　growth,　significantly　improving　the　cycling　performance　of　LMAs　under　harsh　conditions　including　high　current　density　and　high　depth　of　discharge.　Thorough　comparison　of　electrolytes　demonstrated　that　1　M　lithium　bis(fluorosulfonyl)imide　(LiFSI)　in　1,2-dimethoxyethane　(DME)　can　yield　a　robust　and　lithiophobic　LiF-rich　upper　interface　(solid　electrolyte　interphase).　Besides,　the　Sb-based　buffer　layer　forms　a　lithiophilic　lower　interface　on　current　collector.　The　synergy　of　the　upper　and　lower　interfacial　engineering　plays　an　important　role　for　outstanding　cyclability　of　LMAs.　Consequently,　the　plating/stripping　of　Li　can　be　stably　repeated　for　835　and　329　cycles　with　an　average　Coulombic　efficiency　(CE)　above　99%　at　1　and　3　mA　h　cm(-2),　respectively.　Surprisingly,　the　Li||Li　symmetric　cell　can　even　withstand　the　baptism　of　current　density　up　to　20　mA　cm(-2).　The　excellent　performance　validates　that　the　facile　synergistic　regulating　of　interfaces　adjacent　to　the　metallic　Li　anode　provides　an　effective　pathway　to　stabilize　LMAs.