The Jiuqu two mica granite in southern Jiangxi Province, is related to W—Sn mineralizations. The zircon SHRIMP U Pb and LA ICP MS U Pb dating of the Jiuqu granite gave ages of 169±8Ma and 1696±08 Ma, which shows that the granite was produced in the Middle Jurassic. The Ar Ar plateau ages of muscovite and K feldspar are 10080±076 Ma and 1697±12 Ma, respectively. The Ar Ar anti isochron ages of muscovite and K feldspar are 1041±35 Ma and 1704± 22 Ma, respectively. The ages represent the isotopic closure ages of minerals in the rock forming process. The cooling history of the Jiuqu granitic pluton indicates that the cooling velocity of pluton was faster at the early stage and was slower (about 290℃/Ma) at the late stage.The Jiuqu granites are characterized by being riched in Si, alkaline,and poorer in CaO,MgO,TiO2 and P2O5; the DI range from 9504~9557,which reflected the higher evolution of magmatism, and belongs to peraluminous high K—Ca Alkaline; the REE pattern is slightly light inclined REE distribution pattern, and has strongly negative Eu, the εNd（t） values of the Jiuqu granite are -9.51 to -10.12, and T2DM values are 183 to 187Ga. It is belongs to S type granite, which derived form the partial melting of continental crust metamorphic sedmentary rocks equal to Proterozoic, and lower K/Rb values indicate abundant fluids and suffered high degree evolution of magmatism, belong to the record of later stage of magmatism.