Junggar basin is regarded as a largescale composite basin superimposed by intracontinental basin of Meso—Cenozoic and foreland basin of Hercynian. Multiple superimposing formed the fold—thrust zone in the northwestern Junggar foreland basin since Carboniferous. Long and severe tectogenesis of the basement control and impact the sediment of the Lower Jurassic Badaowan Formation. By analysis of core, microcorrugated lamination, earthquake rima, micro fractures, vibration liquefaction, earthquake breccias and other typical structures of seismites were first time identified from the Badaowan Formation. The seismites of the Badaowan Formation indicated that there were intense and frequent earthquakes in Junggar Basin in Early Jurassic which related to Yanshanian movement. The Kewu fault is a synsedimentary fault because it moved strongly and frequently after Indosinian movement stage. Seismites developed along the Kewu faults suggested that it dominated by the syndepositional movement of the faults. The upper plate of the Kewu fault thrust in Junggar Basin that located the lower plate unceasingly and made the study area basement descending consecutively. The descending of basement is the most important cause of the seismites structures were buried quickly and conserved abundantly.