Aral granitic plutons extend from Kayierte to Wushituokesi in Koktokay area in the Southern Altaids. Lithological assemblage is composed principally of porphyritic biotite K-feldspar granite, porphyritic biotite adamellite (central facies), biotite (two-mica) K-feldspar granite, two-mica adamellite (transitional facies) and biotite granite (border facies). LA-ICP-MS zircon U-Pb geochronological and petrogeochemical studies are determined. The results show that the zircon 206Pb/238U weighted average ages of the rocks of the central facise are 210±5Ma and 218.7±3.3Ma, indicating the crystallized-age of the plutons in late Triassic epoch. The granites are high in SiO2(SiO2=65.33%~74.74%), K2O (K2O =3.82~6.02, K2O/Na2O =1.27~2.32) and Al2O3 (Al2O3=12.87%~15.19%, A/CNK=0.85~1.17) and low in TiO2 (less than 0.33), MgO (MgO=0.16%~1.78%) and Fe2O3 (Fe2O3T=1.79%~4.98%), belongs to high K-shoshonite series with metaluminous to slightly peraluminous feature. In addition，they are enriched in total REE contents (123×10-6~363×10-6), with obvious negative Eu anomaly (δEu=0.29~0.60). The trace elements show enrichment in Rb, Th, Sm and Rb/Sr value(0.77~3.56), depletion in Ba, Sr, Ti, Nb, Ta, with the characteristics of S-type granite. Combined with the data of southern margin of Altay, the VAral granitic plutons were formed in the transitional tectonic setting from the post-collisional orogeny to intraplate, derived from partially melted of crust dominated by greywacke contain claystone, and the Koktokay pegmatite No. 3 vein likely has genetic relationship with it.