Irregular　Li　deposition　is　the　major　reason　for　poor　reversibility　and　cycle　instability　in　Li　metal　batteries,　even　leading　to　safety　hazards,　the　causes　of　which　have　been　extensively　explored.　The　structural　disconnection　induced　by　completely　dissolving　Li　in　the　traditional　testing　protocol　is　a　key　factor　accounting　for　irregular　Li　growth　during　the　subsequent　deposition　process.　Herein,　the　critical　role　played　by　the　structural　connectivity　of　electrochemical　Li　reservoir　in　subsequent　Li　deposition　behaviors　is　elucidated　and　a　morphology-performance　correlation　is　established.　The　structural　connection　and　resultant　well-distributed　morphology　of　the　in　situ　electrochemical　Li　reservoir　ensure　efficient　electron　transfer　and　Li+　diffusion　pathway,　finally　leading　to　homogenized　Li　nucleation　and　growth.　Tailoring　the　geometry　of　Li　reservoir　can　improve　the　coulombic　efficiency　and　cyclability　of　anode-free　Li　metal　batteries　by　optimizing　Li　deposition　behavior.　We　elucidated　that　the　kinetical　pathway　can　be　maintained　by　regulating　the　structural　connectivity　of　the　in　situ　induced　electrochemical　Li　reservoir,　which　ensures　efficient　electron　transfer　and　Li+　diffusion　pathway.　The　well-distributed　electrochemical　Li　reservoirs　can　serve　as　nucleation　sites　to　promote　uniform　Li　deposition　and　then　improve　the　coulombic　efficiency　and　cyclability　of　anode-free　Li　metal　batteries　effectively.image