Based on systematically collecting the geochemical data of granittic rocks in the Qimantag Region, eastern Kunlun, this paper discusses the genesis of the various granitic rocks in the earth history using the K2ONa2O classification diagram proposed by Collins, et al. (1982). The results show that the granitic rock in the Jinning period is dominated by Stype without distinct predominant direction; the rocks in Caledonian period are characterized by Atype granite and mainly distributed in the northeastern area. In the Caledonian period，the main type is Atype，the superiority trend is NE，and NW trending belts plays a secondary fiddle with Itype. But in the HercynianIndosinian period，the superiority trend is NW，the main type is Itype at the early and middle stage of Hercynian，and from late Hercynian to Indosinian，the main type is Atype. NE trending belts plays a secondary fiddle with Atype in the same time. During the Yanshanian period，the northern part of central Kunlun fault in the whole area is characterized by Atype granite, while in the south is the new tectonic magmatic belt characterized by type I granite. Furthermore, the northern part of Central Kunlun fault was dominated by the northwestern trending in the early Yanshanian period and by the northeast trending in the late period. The analysis above indicates that at least since Caledonian period the spatial extension，developing scope, genetic type and other aspects of granite in this area have been controlled by activity intensity, and alternate change of mechanical properties in the NEtrending and the NWtrending structural belts，and，the structural belts transfer gradually from north to south in a whole. Therefore， the magmatic belt in Qimantag is not magmatic arc resulting from the same tectonic mechanism, but a complex structural magmatic belt consisting of various genetic type granite and controlled alternately by the NEtrending and the NWtrending structural magmatic belts.