Abstract: On the basis of analyzing the forming conditions of lithologic oil reservoirs in the south of Songliao Basin,the types and distributing features of lithologic oil reservoirs have been summarized. There are 6 types of lithologic oil reservoirs such as updip sandstone pinchout oil reservoir, lenticular sandstone oil reservoir,structural-lithologic oil reservoir,fault-lithologic oil reservoir, hydrodynamic trap oil reservoir and mud fractured oil reservoir. By researching and summarizing, it is thought that there would be 5 forming regularities of lithologic oil reservoirs and approximately 1 billon tons oil resources potential in the southern Songliao Basin. Meanwhile, it is put forward that next target areas should be the frontal zones of the western, westsouth and eastsouth deposition systems.