Abstract: The study area lies in central Eurasian plate,prone to earthquakes.There were 655 earthquakes with a magnitude of 4.7 or more from 1600-1981.By the end of the Paleozoic,this continent had been formed.Since the Pliocene,large-scale uplift has occurred in the Tianshan mountian;the Kunlun mountians and the Qinghai-Xizang Plateau and molasse conglomerate (Q₁^X) have been piled upon the piedmont.In responding to the Early Pleistocene tectonic movement molasse conglomerate was de-formed to result in regional unconformity between Lower and Mid Pleistocene.Since the Miocene the crustal activity in this area has been charecteristic of intermittent uplifting,subsiding and faulting.