The Keping‐tage fold‐and‐thrust belt in southwest Tian Shan is seismically active, yet the most well‐recorded earthquakes occurred south of the mountain front. The lack of large earthquakes beneath the fold‐and‐thrust belt thus hinders our understanding of the orogenic process to the north. The 2020 6.0 Jiashi earthquake is an important event with surface deformation in the fold‐and‐thrust belt well illuminated by Interferometric Synthetic Aperture Radar, providing an opportunity to study the present‐day kinematics of the thrust front through the analysis of satellite measurements of surface deformations. Here, we employ the surface deformation and relocated aftershocks to investigate the fault‐slip distribution associated to this event. Further added by an analysis of Coulomb stress changes, we derive a fault model involving slips on a shallow, low‐angle (∼10°) north‐dipping thrust fault as well as on a left‐lateral tear fault and a high‐angle south‐dipping reverse fault in mid‐crust. Aftershocks at depth reflect the basement‐involved shortening activated by a thin‐skinned thrust faulting event. In addition, this earthquake uplifted the southernmost mountain front with relatively low topography, indicating the basin‐ward propagation of the southwest Tian Shan.