Objectives: There were large scale volcanic rocks strata of Permian in East Junggar Basin,Xinjiang. the Kalagang Group is mainly intermediate acid volcanic rocks，local bimodal volcanic rocks.This artical based on Kalagang Group bimodal volcanic rocks——rhyolite and basalt,to discusses the Late Paleozoic tectonic setting in the Qatukatu area, Eastern Junggar Basin. Combining with the previous research results, attempts to determine and explore the Early Permian tectonic settings provide the basis for defining the closure time of the Junggar Ocean and revealing the tectonic evolution of East Junggar Basin. Methods: This artical based on Kalagang Group bimodal volcanic rocks——rhyolite and basalt,to research the petrology, geochronology, geochemistry. Results: Zircon LA- ICP- MS U- Pb results showed that the rhyolite and basalt ages were 279.5 and 280.4Ma, indicating the formation age of the volcanic rocks of Kalagang Group producted in the early permian. The rhyolites have high SiO2, K2O, Na2O, Al2O3, CaO and low MgO.The REE distribution map shows a “Yan style” distribution and Eu is a negative anomaly.The elment of Ba, Nb, Ta, Sr, P and Ti are loss shown on the trace elemental normalization map.The basalt samples have a slight negative anomaly of Eu , enrich large ion lithophile elements, depletion of high field strength elements Nb,Ta, and loss of Ti; the average value of εHf (t) of rhyolite zircons is +15.3,TDM1(305Ma) and TDM2(cc)(320 Ma) ages are similar to their formation age(279.5 Ma). Conclusions: The bimodal volcanics in this area are not homologous, rhyolite is the result of the mixing of the mantle magma and the melt crustal source .The Qiakuertu region was completely closed before the Early Permian, and was in post- collision tensioning and bimodal volcanic rocks were the product of postcollision extensional tectonic setting.The possibility of the existence of the old Precambrian crystalline basement in the Junggar basin indicates that the area has good potential for oil and gas exploration.