The Ordos Basin is thought as a stable block and has few faults in its interior. In recent years,a large amount of small scale faults have been revealed in the interior of the Ordos basin using 3D seismic. The discoverychanges the thought for the structural characteristics of the basin and the exploration direction for the oil and gas. However, the geometry, kinematics characteristics and genetic mechanism of these faults are still unresolved, and the controlling factors for accumulation of oil and gas are still unclear. In this study, the characteristics of such strike-slip faults developed in different tectonic units of theOrdos basin were compared, and its effect on hydrocarbon were analyzed . Faults develops in the Ordos Basin, trending NEE, NW, N-S and E-W respectively. These faults have the common characteristics (such as subvertical dip angle, small slip distance and concealmen. All the faults show the nature of strike-slip characteristics. However, the dominant strike of faults in various regions of the basin is different: the northern is nearly E-W-trending, the southern is mainly NE-trending, the southwest is NW-trending and the fault strike in the interior of the basin is multi-direction. The formation and evolution of intra-basin faults are controlled by the tectonic stress field around the basin. The faults near the periphery of the basin formed in the similar stress field; and the stress strength is weak in the interior of the basin. Due to the layered structure style of faults in the Ordos basin, the upper and lower petroleum systems are independent. It is mainly fault-fracture clastic reservoirs in the Mesozoic and fault-karst carbonate reservoirs in the Lower Paleozoic. The faults and derived fractures assembly in the interior of the Ordos Basin compose special reservoir sweet spots.