Middle Triassic A-type granitoid and other types of granitoid in the central Kunlun region were formed respectively in post orogeny and collision-orogenic stage of southern Kunlun subplate subducting north. The occurrence of late Triassic muscovite/two-mica granites and S-, I- and A-type granitoids in the central Kunlun region, and I-type granitoid in northern margin of southern Kunlun region are the result of intracontinental subduction, in which the southern Kunlun fault is the underthrust zone. Late Triassic anorogenic A-type granites are a indication that intracontinental subduction of southern Kunlun subplate ended. Meanwhile, the I-, S- and A-type granitoids in the northern Kunlun region were formed by intracontinental subduction of the central Kunlun subplate along the Mid-Kunlun fault in late Triassic epoch. Early Triassic granitoid is not found. Therefore, the early-middle Triassic epoch in the eastern Kunlun area fell into the period of the southern Kunlun subplate underthrusting north along the central Kunlun fault. Both the southern Kunlun fault and the central Kunlun fault went through complete intracontinental subduction in late Triassic epoch.