Proterozoic Eonothem stratum of South China are centralized outcropping in Kangdian area. The frequent magmatic activity in Proterozoic is the window of geological tectonic evolution study on Yangtze craton, which is a burning field of research in recent years. Our group have identified the late Mesoproterozoic gneissic granite lately in area of Huangguayuan, Yuanmou, Yunnan Province, located on the north of S—N trending Yuanmou—Lzhijiang fault. The U Pb age of zircons in granite is 1069.4±6.9Ma（MSWD=0.47, n=18）. The Huangguayuan granites are characterized by high SiO2 (ave. 72.79%), medium alkali contents (ave. Na2O+K2O content of 6.62%), low TiO2 (ave. 0.26%), low CaO (ave. 0.79%), low MgO (ave. 0.52%, ave. Mg# 22.13), and high Al2O3 (ave. 12.84%, ave. A/CNK 1.33), exhibiting the features of sub alkaline granite in the mass. The content of ΣREE is 132.96×10-6~278.72×10-6 with an averageΣREE of 237.00×10-6. They possess the obvious characteristic of high LREE and low HREE, with a δEu value of 0.38 ~0.49. The chondrite normalized REE pattern displays right dipping curves. The trace element patterns show that Ba, Ta, Nb, Sr, P and Ti are obviously depleted, whereas La, Zr, Hf, Y and the large ion lithophile elements such as Rb, Th, U and K are relatively enriched. Petrochemistry shows that, the Huangguayuan granits are A type granite originating from the partial melting of lower crust basic rock. The formation temperature of Huangguayuan granite is about 750℃, and it is the product of extensional tectonics after plate collision. The U Pb age and geochemistry of granites indicate that, besides S—N trending plate convergence, Kangdian area also probably underwent the large scale E—W trending convergence process in late Mesoproterozoic, which is a constituent part of global Grenvillian orogenic movement. The age of granite in this area is highly coincident with the Re Os age of molybdenite in Lala IOCG deposit nearby. It means that extension movement of small landmass in Kangdian area after E—W trending convergence in late Mesoproterozoic is closely related to the final concentration and positioning of metallogenic substance in Lala copper and iron deposit.