Abstract: A recently active tectonic system which strikes NNW is determined by analyzing and Studying the earthquakes, seismic deformation bands and active fault zones along the northeastern margin of the Qinghai-Tibetan Plateau. It consists mainly of a series of modern uplifts alternating with sudsidence zones. The latest tectonic deformation along the north-eastern margin of the plateau was found to have resulted from the activity of the system. In addition, a more detailed discussion of the deformation of the system and the earthquake-prone areas is made.