The　highly　reversible　plating/stripping　of　Zn　is　plagued　by　dendrite　growth　and　side　reactions　on　metallic　Zn　anodes,　retarding　the　commercial　application　of　aqueous　Zn-ion　batteries.　Herein,　a　distinctive　nano　dual-phase　diamond　(NDPD)　comprised　of　an　amorphous-crystalline　heterostructure　is　developed　to　regulate　Zn　deposition　and　mechanically　block　dendrite　growth.　The　rich　amorphous-crystalline　heterointerfaces　in　the　NDPD　endow　modified　Zn　anodes　with　enhanced　Zn　affinity　and　result　in　homogeneous　nucleation.　In　addition,　the　unparalleled　hardness　of　the　NDPD　effectively　overcomes　the　high　growth　stress　of　dendrites　and　mechanically　impedes　their　proliferation.　Moreover,　the　hydrophobic　surfaces　of　the　NDPD　facilitate　the　desolvation　of　hydrate　Zn2+　and　prevent　water-mediated　side　reactions.　Consequently,　the　Zn@NDPD　presents　an　ultrastable　lifespan　exceeding　3200　h　at　5　mA　cm(-2)　and　1　mAh　cm(-2).　The　practical　application　potential　of　Zn@NDPD　is　further　demonstrated　in　full　cells.　This　work　exhibits　the　great　significance　of　a　chemical-mechanical　synergistic　anode　modification　strategy　in　constructing　high-performance　aqueous　Zn-ion　batteries.