Abstract: Remnant thickness distribution maps of all main Cenozoic formations and members of Bohai Bay Basin were obtained by conducting division, comparison and depth validation of seismic profile data for all secondary tectonic units of Bohai Bay Basin,as well as by using geological data of real drilling. These maps clearly reflect the complete sedimentary framework of the basin and the distribution characteristics of the Cenozoic remnant formations. Through deep revealment of the geological information,new evidence was obtained for a correct recognition of the Cenozoic forming and evolution mechanism of Bohai Bay Basin. Theresults of omprehensive analysis and comparison of spacial distribution, sedimentary center and long axis strike of remnant formations of different sequences indicate that the whole basin was under the control of back-arc extensional stress produced by the subduction of the West Pacific Plate beneath the Eurasia Plate from the Kongdian to the Dongying sedimentary periods.However, the influence and interaction of dextral shear stress superimposed continuously in the entire process of Cenozoic forming and evolution of this basin. This stress field is supposed to be related to the combination of the dextral slip activity of Tanlu fault with the far-distance effect of the India-Eurasia collision.