“Golden triangle”area bordered on Yunnan-Guizhou-Guangxi was one of the most important Carlin-type gold deposits concentration areas.Deep understanding of Carlin-type gold deposits in Guizhou and Guangxi Province had reached through several decades studies,but geological environment was very complex in the southeastern Yunnan,and Carlin-type gold deposits produced in the southeastern Yunnan were different from that of America,few studies were taken there.Based on a large number of field work,studies on the geological characteristics combining with geochemistry characteristics were taken,and analysis the genesis of Laozhaiwan gold deposit.The types of alteration in Laozhaiwan gold deposit were mainly silicification and pyritization,and Gold grade was high when silicification and pyritization were both occurred.It could be caculated that fluid density(g/cm3)varied from 0.7 to 4.9,salinity varied from 0.76%to 0.95%and ore-forming pressure(Pa)varied from 1.81×105 to 49.96×105 according to fluid inclusion test results,showed that Laozhaiwan gold deposit was hypabyssal hydrothermal deposit in low temperature and low salinity.According to composition of fluid inclusion analysis,combining with H-O isotope,made theδD-δ18O figure,showed that the fluid of the deposit rooted in formation water and mixed with meteoric waters later. “Golden triangle ” area bordered on Yunnan-Guizhou-Guangxi was one of the most important Carlin-type gold deposits concentration areas. Deep understanding of Carlin-type gold deposits in Guizhou and Guangxi Province had reached through several decades studies, but geological environment was very complex in the southeastern Yunnan, and Carlin-type gold deposits produced in the southeastern Yunnan were different from that of America, few studies were taken there.Based on a large number of field work, studies on the geological characteristics combining with geochemistry characteristics were taken, and analysis the genesis of Laozhaiwan gold deposit. types of alterations in Laozhaiwan gold deposit were mainly silicification and pyritization, and gold grade was high when silicification and pyritization were both occurred. It could be caculated that fluid density (g / cm3) varied from 0.7 to 4.9, salinity varied from 0.76% to 0.95% and ore-forming pressure (Pa) varied from 1.81 × 105 to 49.96 × 105 according to fluid inclusion test results, showed that Laozhaiwan gold deposit was hypabyssal hydrothermal deposit in low temperature and low salinity. According to composition of fluid inclusion analysis, combining with HO isotope, made the δD-δ18O figure, showed that the fluid of the deposit rooted in formation water and mixed with meteoric waters later.