In　order　to　quantitatively　evaluate　resource　efficiency,　this　paper　analyzed　the　law　of　element-flow　in　metallurgy　manufacturing　process　and　the　influence　of　different　element-flows　on　element　resource　efficiency,　and　put　forward　the　definition　of　element　resource　efficiency　for　defining　the　saving　degree　of　natural　resources　in　metallurgy　manufacturing　process.　A　standard　element-flow　diagram　of　metallurgy　manufacturing　process　was　given.　The　influence　of　element-flow　deviated　in　various　ways　from　standard　element-flow　diagram　on　element　resource　efficiency　was　analyzed.　The　relationship　between　element　resource　efficiency　of　metallurgy　manufacturing　process　and　of　its　unit　process　was　discussed.　By　using　the　data　of　a　steel　plant,　the　influence　of　iron-flow　in　steel　manufacturing　process　on　its　iron　resource　efficiency　was　analyzed　as　an　example.　The　result　shows　that　the　input　of　secondary　resources　to　any　unit　process　of　a　manufacturing　process　from　surrounding　increases　the　resource　efficiency　of　the　manufacturing　process;　the　output　of　unqualified　and　other　waste　product　from　any　unit　process　to　surrounding　decreases　the　resource　efficiency　of　the　manufacturing　process;　and　the　recycling　of　material　within　a　unit　process　or　from　a　unit　process　to　its　upper-stream　unit　process　will　not　influence　the　resource　efficiency　of　the　manufacturing　process,　but　will　increase　the　energy　intensity　and　the　cost　of　final　product.