Lithologic oil-gas fields with low abundance in China have enormous resource potential and reserves scale which are widely distributed in Mesozoic-Paleozoic stratum and possess favorable geological background for the formation of oil-gas reservoir. Large lithologic oil-gas fields with low abundance are important future exploration field in China, and their formation conditions and distribution rules are noncommittal. Based on a mass of statistical analysis and geological study, are probed into formation conditions, distribution characteristics, enrichment rules and future exploration fields of large lithologic oil-gas fields. Several geological conditions are pointed out about large lithologic oil-gas fields with low abundance, i.e. hydrocarbon source rock with large area and high abundance, flat structure pattern, steady sedimentary background, large scale sedimentary system and constructive diagenesis environment. In this paper are systematically analyzed the controlling factors of formation and distribution rules of large lithologic oil-gas fields from four aspects. The first is that the main riverway sandbody in large continental deltaic plain-front, the high energy facies belt of marine facies such as reef-flat in platform edge, onshore sandbody are favorable distribution region of large lithologic oil-gas fields; The second is the constructive diagenesis are high quality reservoir and favorable distribution region of large oil-gas fields such as secondary corrosion facies, dolomite lithification facies, weathering leaching facies , chlorite thin film cementation facies and TSR facies; The third is the ancient terrain( ancient uplift , slope, up-and-down belt, uplift of the nose belt), rift/fault/ break-slope belt, tectonic reversal belt, crack belt and stratum denudation pinch belt are favorable structure conditions and enrichment area of large oil-gas fields formation; The fourth is the distributions and enrichment of large lithologic oil-gas fields with low abundance are generally controlled by "Sweet Point" that is controlled by three facors, namely structure, sedimentary and diagenesis.Research result provide theoretic foundation and scientific foundation for the preparative fields and reserves supersedence of oil-gas exploration.