Localized　deposition　behavior　tends　to　induce　the　growth　of　lithium　dendrite　and　hinder　the　the　full　utilization　of　lithium　storage　space,　significantly　impeding　the　practical　application　of　3D　conductive　hosts.　Here,　a　novel　synchronous　deposition　mode　is　proposed　for　the　first　time　through　hierarchical　structure　design　of　3D　Li　host.　The　top-down　gradually　enhanced　lithiophilicity　and　conductivity　of　3D　scaffold　provide　sufficient　driving　force　for　Li+　to　migrate　downward,　promoting　synchronous　Li　deposition　within　the　entire　space　of　the　host.　Notably,　the　novel　deposition　mode　has　been　theoretically　and　experimentally　validated　through　finite　element　simulation　and　in　situ　optical　microscopy,　respectively.　The　meticulously　designed　strategy　not　only　maximizes　the　utilization　of　the　entire　3D　scaffold　space　but　also　prevents　the　formation　of　Li　dendrites　under　high　current　rate.　Consequently,　the　symmetric　Li//Li　cell　exhibits　a　long-term　cycling　lifespan　over　3700　h　with　a　low　overpotential　of　15.6　mV,　together　with　a　Coulombic　efficiency　as　high　as　99.5%　over　300　cycles　at　3　mA　cm-2.　The　full　cell　paired　with　LiFePO4　cathode　demonstrates　a　cycling　lifespan　of　1000　cycles　with　a　capacity　retention　rate　of　91.6%.　The　proposed　synchronous　deposition　strategy　opens　up　a　new　paradigm　for　the　design　and　construction　of　3D　hosts　for　dendrite-free　Li　metal　anode.