Abstract: Lithologic reservoirs are an important domain for oil and gas exploration and enhancement of reserve and production in Beier Depression. However, the reservoir-formation laws are still less studied and recognized, thus greatly restricting the exploration progress of lithologic reservoirs. In this study, based on logging, seismic and physical property analysis data, the control factors and distribution laws of lithologic reservoir formation in various sags of Beier Depression were systematically analyzed through reservoir anatomization and analysis of reservoir-formation conditions. It is believed that lithologic traps, reservoir physical properties and transporting pathways are major factors for controlling the formation and distribution of lithologic reservoirs in this area. The development of lithologic traps is controlled by the faulted slope break belts, i.e., in the vertical level, the type of sand bodies is controls by that of the faulted slope break belts, mainly developing the near-shore subaqueous fan formed by fault-scarp slope break belt, turbidite fan formed by fault-terrace slope-break belt, fan delta sand bodies formed by fault-slope slope break belt and other lithologic traps; in the horizontal level , spatial distribution of the developed sand bodies is controlled by planar pattern of the faulted slope break belt, mainly forming the fault-bend, fault-connection, fault-gully and cross-type distribution patterns. The reservoir formation of lithologic trap is controlled by critical physical properties of sandstone reservoirs. Reservoirs are formed only in lithologic traps with sandstone physical properties higher than critical physical properties. The distribution of lithologic reservoirs is controlled by fault-axial sand bodies. In particular, the axial section of fan delta sand bodies on the downthrown side of sand control fault is favorable for hydrocarbon accumulation.