Abstract: This paper analyzes the deformation features and the genetic mechanism of the main oil?bearing structures in Jiuxi basin. The heterogeneous episodic activity of Himalayan movement caused northward thrusting and parallel arrangement of the three rows of thrust faults in North Qilian, Laojunmiao and Xinminbao areas. The main reason for forming three segmental deformations in EW direction of North Qilian mountain is its elastic defference of the rocks. The elastic defferences between new and old strata, the tectonic stress direction, and size heterogeneity result in the fault bend folds in Qingxi oilfield, the fault detachment folds in Yaerxia Cretaceous reservoir and the fault propagation folds in Tertiary reservoirs. According to the oil reservoir profile with connected wells created by fine isochronous stratigraphic division and correlation, some new oil and gas resources are found in Yaerxia Cretaceous reservoir and in the northern margin thrust belt of Laojunmiao anticline. This materially supports the sustainable development of Yumen oilfield.