Lithium　metal　is　expected　to　become　one　of　the　most　high-energy　density　anode　materials　for　electronic　storage　device.　However,　sharp　lithium　dendrites　and　accumulated　＂dead　lithium＂　cause　the　consume　of　electrolyte　and　the　reduction　in　stability　for　lithium　metal　batteries　and　further　lead　to　serious　safety　risks　in　the　practical　application.　To　alleviate　this　problem,　we　firstly　construct　a　uniform　and　dense　amorphous　Li3PO4　thin　film　with　thickness　of　10　nm　via　atomic　layer　deposition　(ALD)　coating　lithium　metal　as　anode.　The　as-prepared　Li3PO4　thin　film　improves　the　cycling　life　of　the　symmetrical　batteries　more　than　double　and　successfully　resists　the　shock　of　high　current.　The　growth　of　needle-like　lithium　dendrites　are　obviously　suppressed　due　to　film＇s　amorphous　characteristics　and　higher　modulus.　The　artificial　SEI　layer　mainly　homogenizes　the　lithium　ion　flux　on　the　electrode　surface　to　achieve　the　purpose　of　uniform　Li　deposition.