The giant Dahutang tungsten polymetallic deposits in northern Jiangxi are closely related to the late Mesozoic Yanshanian granites. These granites,with related deposits, intrude the Neoproterozoic Shuangqiaoshan Group sedimentary rocks and the Neoproterozoic Jiuling granodiorite, and are believed to have a close genetic link to these sedimentary rocks. The meta- sedimentary rocks of the Shuangqiaoshan Group display large composition 〖JP2〗variations with low Na 2O, MgO, CaO and high Al 2O 3. Their SiO 2/Al 2O 3〖JP〗 ratios indicate medium maturity, and high CIA values suggest strong chemical weathering occurring in the source area of these sedimentary rocks. The sedimentary rocks of the Shuangqiaoshan Group are relatively depleted in Ba, Sr, Sn, Nb, Cr and Ni, and enriched in Li, Be, Cs, Rb and W. These sedimentary rocks also have high rare earth elements (REE). The characteristics of major and trace elements suggest that the source area of sedimentary rocks of the Shuangqiaoshan Group contains more mafic to intermediate igneous rocks and less old recycled materials. Rare metal elements, such as Li, Nb, Be and Sn, show a good positive correlation with the CIA values of rocks, indicating that the increase of clay minerals is conducive to the enrichment of rare metal elements in sedimentary rocks. In this study, the GeoPS software is used to model the partial melting of the rocks. The modelling results show that it is difficult to directly produce melts with compositions similar to the primitive magma of the late Mesozoic Dahutang granites from the meta- sedimentary rocks of the Shuangqiaoshan Group, whereas magma similar to the Dahutang granite can be produced from the mixture of the meta- sedimentary rocks and meta- basalts in the Shuangqiaoshan Group with an 82 ratio. This partial melting model with the participation of mafic volcanic rocks can explain not only the characteristics of the Cu- Mo mineralization often associated with the W deposits in the northern Jiangxi,but also the low oxygen isotope compositions of zircons in the Dahutang granite.