Paths + DEM” interferometric process was made for the PALSAR SAR data before and after the Yushu M_s7.1 Earthquake, which yielded a high-quality co-seismic InSAR strip image and absolutely surface deformation. Based on the deformation scale, deformation magnitude and deformation gradient, in combination with tectonic setting of the area, the following conclusions can be drawn:1) Yushu earthquake triggered a 70 km NWW-extending mutation belt, with a southern section showing greater dislocation and deformation gradient, which will induce surface raptures, and No.4 segment in northwestern part showing weaker deformation and no ruptures on the ground surface; 2) the SAR motive directions from both sides of mutation belt indicate a dominant sinistral movement of seisgenic faults; and 3) the macro-epicenter is located on the mutation belt 16 km northwest of Yushu County.