///On April 14, 2010, a Ms7.1 earthquake struck the Yushu County, Qinghai Province, China. In this paper, the authors infer its tectonic activity features: 1) Yushu earthquake triggered a NWW extend, sinistral step, “S” shape strike-slip fault deformation belt; 2) the difference of two walls’ movement in direction and amount shows that the seisgenic fault is a sinistral strike-slip and SW wall is an initiative wall; 3) the macro-epicenter can be located on mutation belt of NW 16 km of Yushu County; 4) the deformation amount, surface track and rupture amplitude of seisgenic fault indicate that the aftershocks will migrate towards NW alone fault; and 5) this earthquake is the results of Qiangtang Block’s activity and does not directly related with Wenchuan Earthquake induced by Bayan Har Block.