<p>In the Ordos Basin, which has been explored for over a hundred years, there are still areas that have not been fully understood. Haotan New Area is a newly developed block in recent years, and the Yan’an Formation strata in the basin area have not been fully understood in the new area, which restricts the pace of oil and gas exploration and development in the region. On the basis of previous research, this article studies the sedimentary evolution characteristics of the new area from the aspects of sedimentary evolution and reservoir control factors. Yan 10 belongs to braided river sedimentation, and it is found that Yan 10+Fuxian period has braided river sedimentation characteristic.Yan 9-Yan 8 is greatly influenced by hydrodynamics and is characterized by the development of delta plain subfacies sedimentary environments, underwater distributary channels, and microfacies of inter distributary depressions. During the Yan 10 period, there were three main microfacies: floodplain, edge plain, and stagnant sediment in the river channel. In addition, the influence of sedimentary environment on reservoir development was analyzed and studied. Sedimentary environment, diagenesis, cementation and compaction play a role in the development of reservoir pores, and dissolution can improve reservoir space. Provide predictions and recommendations for the next steps of exploration and development.</p>