The Ordos basin has long been considered a stable block with few faults within its interior. However, recent advancements in 3D seismic technology have revealed a significant number of small- scale faults within the basin, challenging previous assumptions about its structural characteristics and influencing the direction of the oil and gas exploration. Despite these discoveries, the geometry, kinematics characteristics, and genetic mechanism of these faults remain unresolved, and the factors controlling the accumulation of oil and gas in relation to these faults are still unclear. In this study, we aim to compare the characteristics of strike- slip faults developed in different units of the Ordos basin and analyze their impact on hydrocarbon accumulation. The observed faults in the Ordos basin exhibits various trends, including ENE, NW, N- S, and E- W. These faults share common features such as sub- vertical dip angle, small slip distance, and concealment. Furthermore, all of these faults show the nature of strike- slip characteristics. However, the dominant strike direction of faults varies across different regions of the basin, which is nearly E- W- trending in the north, ENE- trending in the south, the NW- trending in the southwest, and multi- direction strikes of faults were exhibited in the interior of the basin. The formation and evolution of these intrabasinal faults are controlled by the tectonic stress surrounding the basin, with faults in periphery forming under similar stress conditions and the stress strength being weaker within the interior of the basin. Due to the discontinuity structure style of faults in the Ordos basin, the upper and lower petroleum systems are independent of each other. The Mesozoic internal primarily consists of fault- fracture volume in clastic reservoirs, while the Lower Paleozoic interval comprises fault- karst volume in carbonate reservoirs. The assemblage of faults and associated fractures within the interior of the Ordos basin represents unique reservoir sweet spots.