Abstract:The deformation of Mw 66 Earthquake on Nov25, 2016 in West Kunlun Mountain was observed from two directions using by Sentinel1 SAR databased InSAR technology. Based on the tectonic background, this study obtained a centimeterscale 3D deformation field and then verified its accuracy through comparison with surface ruptures and focal mechanism of this earthquake. InSARbased deformation field provides some recognition for the coseismic deformation and neotectonic movement patterns. ①The differences of coseismic deformation manifests the extension of seismogenic fault along the piedmont of West Kunlun mountain, striking 104°, 70km long and dipping SSE, which are characterized by mainly normal slip with dextral strikeslip. ②The coseismic deformation covers an elliptic area of about 100 km long and 60 km wide, showing multiple centers and multiple directions, with hanging wall subsiding 10~15 cm, horizontal sliding 2~6 cm, and footwall sliding 8~14 cm and vertical deformation of only3~1cm. Vertical deformation of hanging wall and footwall presents tensile features of four quadrants, in agreement with results of strikeslip shearing. ③Coseismic deformation is dominated by mode of elastic rebound, that is, the longterm tectonic stress was the driver for uplifting and northward intrusion of this region, while the local geomorphologies, i.e. surface rupture and graben basin, were the result of elastic rebound. ④The persistent uplift in the NE margin of Pamir plateau and structural deformation of normal faulting by this earthquake has confirmed the synorogenic extension model of the Muji basin (ieKougur extension), rather than the result of NWtrending extension of rightslip Karakoram faulting activity.