Abstract: The Xitian W-Sn polymetallic ore field is located between the Hunan and Jiangxi provinces, North part of the Nanling metallogenic belt. The Xitian granitic pluton is a multi-stage granitic complex.Eight samples were analyzed through LA-MC-ICP MS zircon U-Pb and Lu-Hf isotopes and show that four of them are Indosinian (226-225Ma), the other four are Yanshanian (166~158Ma). Thereinto, εHf(t) and TDM2 values of Indosinian granites are -4.59~-10.82 and 2011~1534Ma. According to whether normal distribution characteristics, εHf(t) values can be divided into seven groups. Similarly, εHf(t) and TDM2 values of Yanshanian granite are -4.32~-9.96 and 1896~1429Ma. And theirεHf(t)values can be divided into five groups. The same Hf isotopic compositions indicate the Indosinian and Yanshanian granites are homologous. They were all derived from late Paleo-proterozoic to early Meso-proterozoic partial melting of crust materials. Hf isotope heterogeneity in the source region probably resulted in large-scale εHf(t) values. Moreover, Four muscovite or phlogopite samples from quartz veins and greisens yielded 150-148Ma through the 40Ar-39Ar dating methods.. This period of the hydrothermal activity and mineralization should be related to the latest magmatic activity. Compared with pre-existing rock-forming and metallogenetic ages, the Xitian granitc body should be divided into three pulses, Indosinian (230~215Ma), the early Yanshanian (165~151Ma), and the late Yanshanian (152~142Ma).