Abstract: In recent years, ring structure in south Ordos basin has gradually aroused people's concern and it has many explanation for its formation. Based on the field geological study, this paper studies, analyses and compares a variety of data. We find that there is an intimate connection between Ordos southern annular region and Qinqi through in every major tectonic period and they are in the same stress field, the main cause of the ring structure in south Ordos basin is the interaction between it and the blocks around it, such as compression, collision, rotation and abrasion, and the southern Ordos basin ring is impacted by multi-phase tectonics and the greatest cause for its lifting and formation is Yanshan movement and Himalayan movement.