The　Huangtian　tungsten　deposit　is　located　in　the　northern　margin　of　the　Laojunshan　polynietallic　metallogenic　zone　in　southeastern　Yunnan.　It　is　a　newly　discovered　large-scale　scheelite　deposit　in　recent　years.　Scheelite　is　divided　into　two　stages　from　early　to　late:　scheelite-fluorite-quartz　stage　(scheelite　I),　scheelite-carbonate　stage(scheelite　II);　Four　types:　scheelite　I-a,　scheelite　I-b,　scheelite　II-a,　scheelite　II-b.The　scheelite　I-b　and　II　have　obvious　oscillating　rings.In　order　to　determine　the　source　and　evolution　of　its　ore-forming　fluids,　based　on　the　detailed　borehole　core　cataloging　and　the　study　of　mineral　microfabrication,　LA-ICP-MS　was　used　to　analyze　the　trace　and　rare　earth　elements　in　scheelite　at　different　stages.　Our　data　show　that　the　rare　earth　elements　in　scheelite　are　mainly　controlled　by　the　substitution　mechanism　of　3Ca-2REE　+EHCa,　the　distribution　of　rare　earth　elements　in　scheelite　is　obviously　mhomogeneous,　but　they　are　all　LREE-enriched　types,　similar　to　the　chondrite　partition　pattern　of　the　Laojunshan　granite.　The　LREE-MREE-HREE　diagram　of　scheelite　and　the　Sm/Nd　ratio　show　that　it　is　closely　related　to　the　Laojunshan　granite.Except　for　some　test　points　of　early　scheelite　I-a,　which　showed　negative　Eu　anomaly,　the　rest　of　the　test　points　showed　positive　Eu　anomaly,　Eu　also　changes　from　the　Eu　dominated　to　Eu-　dominated,　and　the　content　of　Mo　in　scheelite　also　changed.lt　gradually　decreases,　indicating　that　the　oxygen　fugacity　of　the　ore-forming　fluid　decreases　gradually　from　the　early　stage　to　the　late　stage.　In　addition,　the　Sr　content(36.6x10　-619x10,　average　206.25x10)　in　scheelite　is　relatively　high,　and　the　surrounding　rocks　of　the　deposit　are　mainly　marine　sedimentary　carbonate　rocks.　It　is　speculated　that　the　water-rock　reaction　is　as　follows:　Ore-forming　fluids　provide　a　large　amount　of　Sr　and　Ca.　©　2023　China　Geological　Survey.　All　rights　reserved.