The Xintianling deposit is one of the largest skarn-type scheelite deposits in South China，and its mineralization has undergone complex magmatic and hydrothermal processes.Taking the skarn garnet in the Xintianling deposit as the research object，the U-Pb dating，in-situ major and trace element analysis of garnet were carried out by EPMA and LA-ICP-MS in-situ micro-area testing techniques.The U-Pb dating reveals that the age of ore-related garnet in Xintianling deposit is ca.（159.5±3.0）Ma，which is consistent with that of the fine-grained porphyritic biotite granite（164~157 Ma）of the Qitianling rock mass，indicating that the Xintianling tungsten mineraliztion is closely related to the Qitianling rock mass.Based on the mineral assemblages and backscattering images，it is determined that there are three generations of garnet in the Xintianling tungsten deposit.According to the structural characteristics of garnets in the backscattered images，the garnets in the Xintianling deposit can be divided into three generations，namely，the early stage dark garnet（Grt1），the middle stage garnet with obvious oscillation zone（Grt2） and the late stage bright garnet （Grt3）.Among them，Grt2 can be divided into Grt2-1 with oscillatory zones and Grt2-2 with thick oscillatory zones.Grt1，Grt2-1and Grt3 show the left-skewed REE patterns with LREE depleted and HREE enrichment.Grt1 has an obvious negative Eu anomaly，Grt2-1 has a weak Eu negative anomaly，and Grt3 has a weak Eu negative anomaly.In contrast，Grt2-2 has a “hump-type” REE pattern with LREE enrichment and HREE depleted，and the weak Eu positive anomaly.From Grt1 to Grt3，the content of Mn in garnet showes a trend of first decreasing and then rising，and the W content in Grt3 is higher than Grt2 but lower than Grt1.These results suggest that the Xintianling deposit has experienced multiple hydrothermal processes，and the oxygen fugacity and temperature of the ore fluid first increas and then decreases，and the pressure pH value first decreases and then increases during the ore-forming processes.Combined with the variations of W content in garnet from different mineralization stages，it is considered that the mineralization of tungsten in the Xintianling deposit mainly occurs in the retrograde metamorphic stage，and undergoes the process of dissolution-reprecipitation in the late retrograde metamorphic stage.