Abstract: Abstract：The analysis and processing of 12-second deep reflection seismic data obtained from Bachu to Tazhong in Tarim basin show that, in NS direction, the basement is gradually uplifted from He-3 well through Hetian-1 well to He-4 well, with the basement becoming deeper from He-4 well southwards; in EW direction, the basement of Bachu uplift is relatively shallow, and becomes deeper at Tazhong. Through processing, the authors have found that, besides commonly seen reflection structures of T4-T9 layers, effective reflection can also be seen in the deep layers beneath the basement. Based on preliminary interpretation and geological analysis, the authors hold that the processed profile has good continuity of phase axis, high signal-to-noise ratio and homing accuracy and reliable deep reflection information. The tectonic framework reflected by the profile is clear and of fairly large scale. The authors’ work has confirmed the underground structure along the deployed survey line of the work area, and also revealed structures or structural manifestations which had not been detected by previous researchers, thus enriching the understanding of the structural characteristics and structural evolution in this region.