The Hailar Basin, in northern part of the Inner Mongolia Autonomous Region and to the west side of the Da Hinggan mountains, was a Late Mesozoic-Paleogene basin, with the basement being Hercynides. The boundary faults to control the basin developing of NE- and NNE-strikings created in Early Cretaceous, and overprinted by later deformations. The sediments in the Hailar Basin could be divided into three main structural layers, in ascending order, the Upper Member of Hingganling Group, the Tongbomiao Formation and Nantun Formation making up the fault-depression layer, the Damoguaihe Formation and Yimin Formation making up the faulting-sinking transitional layer, and the Upper Cretaceous Qingyuangang Formation and the Paleogene being dawn-warping layer. The basin shrank and closed in Paleogene, and the NE-striking faults reversed and trapped the oil-gas by a nearly W-E compressive stress field. Another generation of rifting and extension occurred in Hailar area during Neogene, so that the neotectonics was relatively active in the area. The paper described the main neotectonic phenomena, such as the Pleistocene lacustrine basins, nowadays surface runoffs and the tilting structures, and point out the neotectonics being characterized with inheritance and enhancement, which resulted in the depressions of the Hailar Basin subsided further in Neogene. Based on the basin evolution, the potentials of oil-gas exploration in the Hailar Basin were discussed and the NE-striking structures might be main targets.