In this article, technique of apatite fission track length, the seismic strata velocity method, R_o method, sound wave time difference method and geologic extrapolation are used to get the eroded strata thickness of Tertiary, Jurassic and Cretaceous in the Bohai Bay basin area. Their original sedimentary thicknesses are restored, and the distribution of original strata, prototype and the distribution of the basin in different times are analyzed. It is considered, in the Tertiary, the basin is a big inner continental depression, and in the Jurassic and Cretaceous, the basin is a group of small inter-mountain depression elongated in the ENE direction. In the Cenozoic, a group of half-graben depression elongated in the NNE direction are developed. Because of the superposition of relic basin of different ages in the area of the Bohai Bay basin, 4 types of superposition units are formed: (1) Mesozoic depression and Cenozoic depression; (2) Mesozoic depression and Cenozoic uplift; (3) Mesozoic uplift and Cenozoic depression; and (4) Mesozoic uplift and Cenozoic uplift. Because of different superposition units experienced different burial and thermal evolution history, they have different petroleum geological importance.