Abstract: Tangba Gold Deposit is located in the east part of Wenxian-Kangxian gold metallogenic sub-belt in the south part of west Qinling gold metallogenic belt and is a quartz vein type gold deposit. Outdoor geological survey finds that the ore body mainly occurs in the fault around the granite-porphyry dyke and is closely related to granite porphyry spatially. The metallogenesis can be classified into 3 phases. Fluid inclusion microscopic thermometry results show that fluid inclusion types in different phases are similar， the metallogenic temperature of the deposit is 156.9 ℃-303.2 ℃， salinity is 1.82 ％-15.67 ％， density is 0.76-0.99 g/cm³， depth is 5.18-7.43 km； the ore-forming fluids are characterized by medium low temperature， medium low salinity， low density and medium hypabyssal features. Inclusion laser Raman spectrum analysis shows that the gas phase compositions in inclusions are mainly CO₂， H₂O and minor N₂， the liquid phase compositions are mainly H₂O， indicating the inclusion belong to a H₂O-Na Cl±CO₂ system. H-O-S isotopic analysis results show that the δ¹⁸O_H2O in Tangba Gold Deposit is 5.98 ‰ -9.87 ‰， δD_V-SMOW is -80.6 ‰ --74.5 ‰， δ³⁴S is -1.9 ‰ ~8.0 ‰； based on the outdoor occurrence characteristics of the deposit， the ore-forming fluids mainly originate from magmatic fluids. Comprehensive analysis takes that the deposit is a medium low temperature， medium low salinity post-magmatic hydrothermal gold deposit related to magmatism.