Exploration of stratigraphic-lithologic reservoirs in Erlian Basin has made a significant breakthrough. 30~50 million tons of oil reserves have been found from stratigraphic-lithologic reservoirs in several middle- small fault sags with area of 1 000 to 2 000 km2. According to the exploration and geologic research, it showed that the forming, distribution and enrichment of the stratigraphic- lithologic reservoirs are characterized by“Multi-factor controlling, four - factor entrapping and key- factor enrichment”. The forming and distribution of sand body are controlled by the types of the structural belt, contemporaneous fault, system tract, slope break belt and sedimentary facies. The accumulation of the sand body traps is restricted by four factors, including hydrocarbon migration pathway, hydrodynamic force, critical physical property of reservoir and confining factor of sand bodies. The enrichment of the stratigraphic- lithologic reservoirs is controlled by three key factors, including abundant oil sources, high quality sand body traps and main confluent passageway.