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-NaCl±CO₂ system.H-O-S isotopic analysis results show that the δ¹⁸O_H2O in Tangba Gold Deposit is 5.98 ‰-9.87 ‰,δDV-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.