Nankunshan aluminousA_type granite occurs in Longkou County of Guangdong Province, with a outcrop area of about 200 km2. With medium-grained texture, the granite is composed of protolithionite, albite plagioclase, perthite and quartz. The rock usually is weakly peralumious and subalkaline with high alkali ratio rangeand NK/A values. The granite contains markedly low MgO and CaO and extremely high (FeO+Fe2O3) with ahigh FeO*/(FeO*+MgO) ratio. Nankunshan granite is evidently rich in F and poor in Cl, having a high F/Clratio range. Based on its high Zr contents, the calculated zircon saturation temperatures of the rock are relativelyhigh (810~847℃), consistent with those of A_type granites in Australia (839℃,on average). In terms oftrace element data, the granite has high 104Ga/Al and (Zr+Nb+Ce+Y) values. These values are higher than the low_limited values of 2.6 and 350(×10-6) for aluminous A_type granites in Lachlan Fold Belt of Australiarespectively. The rock has higher total REE contents and strongly Eu negative anomalies, showing a sea_gullshaped REE partition patterns on its chondrite_normalized diagrams, and Rb, U, Th, Nb, Ta, Zr, Hf, Sm el-ements show evidently positive anomalies on the primitive mantle_normalized trace element spider diagrams. Thegranite possesses relatively highεNd(t) values (-1.54~-2.87) and lowδ18O Values (7.9‰~9.8‰), indi-cating that its source rocks are located in the interaction belts between the mantle and the crust. Mantle compo-nent accounts for about 63%~69% in its total source materials, as calculated by the mixing model of the mantl and the crust end members on the basis of the isotopic data. These features are obviously similar to those of alu-minous A_type granites elsewhere in the world. The discovery is important for study on the extensional structureof late Yanshanian crust in eastern part of Nanling Mountain.