Early Jurassic softsediment deformation occuring within lacustrine sandstone is distributed mainly in the Wuqia region, SW Tianshan Mountains, Xinjiang. Triggered by earthquakes, softsediment deformation was found to occur in three layers of the Lower Jurassic Kangsu Formation. The main styles of deformation structures contain load cast, ballandpillow, droplet, cusps, homogeneous layer, and liquefied unconformity. Three deformation layers reflect that the Wuqia region had undergone three strong earthquakes at the end of Early Jurassic. The differences of deformation mechanisms may represent varying magnitudes of earthquakes. During the Late Jurassic, the Wuqia area was located at the pullapart basin controlled by significant Talas—Ferghana strikeslip fault in central Asia, accompanied by the softsediment deformation induced by the earthquakes. It is suggested in this paper that the magnitudes of the paleoseisms may range from 6.5 to 7.