Abstract: Coseismic deformation field of the Yutian M_W6.3 earthquake, occurred in Xinjiang on June 26, 2020 was extracted using Sentinel-1A/B SAR data through InSAR processing. Using the co-seismic deformation field constraints of the ascending and descending orbits, the MPSO algorithm and the Bayesian method were used to invert the geometric parameters of the seismogenic fault. Then, the SDM method was used to obtain the non-uniform slipdistribution of the seismogenic fault, and the co-seismic Coulomb stress change and the stress disturbance to surrounding faults were analyzed. The results show that the coseismic deformation field takes the NS direction as the long axis, showing the characteristics of subsidence in the west and uplift in the east, and the uplift is significantly smaller than the subsidence. The inversion of non-uniform slip shows that the average slip of the seismogenic fault is 0.13 m. The average slip angle is -104.56°. The 2020 Yutian earthquake is a typical normal fault rupture event. The maximum slip is about 0.55 m, and the slip angle at the maximum slip is -105.2° at a vertical depth of 14.42 km.The released seismic moment energy is about 3.65×10¹⁸ N·m, which is equivalent to the moment magnitude M_W6.34. The co-seismic Coulomb stress change has a stress unloading effect on the Qiongmuzitag fault in the west and the Nierkule southern margin fault, and it has a stress loading effect on the Muziluk-Whale Lake fault in the north, combined with the coseismic Coulomb stress Regarding the disturbance of the surrounding faults, the earthquake may have a greater impact on the western end of the Qiongmuztag fault and the Muzluk-Whale Lake fault.

Key words: the 2020 Yutian M_W6.3 earthquake, InSAR, Deformation inversion, Fault parameters, Slip distribution