Based on the data of earthquakes (MS≥7),earthquake deformation zones,active faults and active tectonic system in northeastern Qinghai-Xizang Plateau,combined with the theories and methods of the earth system science,geological mechanics,seismogeology and modern seismology,the 'commonness' of the strong earthquakes in the region is discussed. A new concept,named as contemporary tectonic deformation system of the regional crust characterized by three dimensional dynamics is proposed.A new cognition on the mechanism and distribution of the earthquakes in the region is presented.%依据青藏高原东北部地区的大震(MS≥7)、大震形变带、活动断裂和活动构造体系的资料,以地球系统科学、地质力学、地震地质学、现代地震学的理论和方法为主线,对该区内大震的"共性"进行了探讨,提出了具有三维空间动态的区域地壳现今构造形变系统的新概念,并对该区内地震的形成机制、分布规律等科学问题提出了新的见解.
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