Abstract:The large left lateral strike-slip faults are responsible for continental deformation of Qinghai-Tibet Plateau. Recent researches on Altyn Tagh fault have called attention to view of how northern edge of the Plateau has grown. Field survey and previous results suggest that the slip rate of Altyn Tagh fault reduced abruptly at two sides of triple junction from Subei County to Shule River and the thrust faults, strike faults in western segment of the Qilian Mountain absorbed the sinistral displacement of Altyn Tagh fault, and thus the present trace disappeared in west of Jiuquan basin. But the Altyn Tagh fault had ever extended into Alxa block before mid-Miocene. The Plateau began to extend laterally along the Altyn Tagh fault at the almost same slip rate after collision between the kohistan and Eurasian plates, and there is no obvious uplift on both sides of the fault. Then, the East Kunlun and Qilian orogenic belts prominently uplifted successively, and the lateral extension of the Altyn Tagh fault decreased rapidly. Therefore, a coupling interaction exists between the extrusion of the Altyn Tagh fault and the uplift of the East Kunlun and Qilian orogenic belts.