On November 25, 2016, a M(W)6. 6 earthquake occurred in Aketao County, Xinjiang. In this paper, the coseismic deformation field of the earthquake is obtained by using Sentinel-1A TOPSAR data and ALOS2 fine mode data. The interferogram deformation field is distributed along the Muji fault, showing that the earthquake rupture length can reach 70 km, and two deformation centers are formed on the surface. The deformation field eastern to the epicentral is fringe-dense, but the western part is sparsely and has a wide influence range. The cross-sectional profile shows that the maximum deformation of Line of Sight can reach 12 cm. The three-dimensional deformation field of the surface is solved by a multi-angle least square iterative decomposition method constrainted by prior knowledge. The results show that the vertical downward movement of the epicentral eastern deformation center can reach up to 20 cm, and the westward movement of the south side of the Muji fault can reach 10 cm, which shows that the fault main motion characteristics is dextral strike, and have normal slip component. Firstly, the method of forward simulation is used to determine source parameter of the two-segment fault model to recover the observed deformation field, and then the InSAR observation data is used as the constraint to invert the fine slip distribution on the fault plane. The result shows that the earthquake consists of two events. The first event is dominated by dextral strike and occurred on the western section with the striking 103 degrees, the inclination is 76 degrees, the rake angle is -167 degrees, the focal depth is 10.1 km, the cumulative seismic moment is 7.2 X 10(18) N center dot M. The second event occurred on the eastern section with the striking 109 degrees, the dip 55 degrees, the rake -160 degrees, the focal depth 5.3 km and the cumulative seismic moment 7.76 X 10(18) N center dot M, but which has normal slip component. It is a tectonic earthquake occurred at Gongur Shan extensional system.
