Objectives: During the Cenozoic evolution of the Liaodong(eastern Liaoning) Bay Depression, Bohai Bay basin, it was controlled by the interaction of extension and strike- slip stress. These two properties stress changed in different stages, result in the complicated superposition and ratio between extension and strike- slip. This complicated relationship is one of the most important factors for the evolution of the depression, but it is a lack of research. In this paper, we aim to extract the superposition and ratio of extension and strike- slip and restore the Cenozoic evolution of the Liaodong Bay Depression. Methods: Based on fine interpretation of 3D seismic data, this paper restored the tectonic evolution history of the typical section and calculated the cross- section extension rate through balanced cross- section method, which were parallel to or perpendicular to the main fault in Liaoxi sag and Liaozhong sag. Finally, superposition and ratio of extension and strike- slip were analyzed at the different stage in the Liaodong bay depression in Cenozoic. Results: The result shows that Liaodong Bay Depression was dominated by extension, and strike- slip was relatively weak during the sedimentary period from Kongdian Formation to Sha- 3 Member. While Liaodong Bay Depression was controlled by weak extension and weak strike- slip during Sha- 2 and Sha- 1 Member depositional period. Further，Liaodong Bay Depression was dominated by intense strike- slip and weak extension during Dongying Formation depositional period. The strike- slip displacement of Liaozhong and Liaodong area was larger than Liaoxi area, while the extension displacement of Liaoxi area was larger than Liaozhong and Liaodong area at this stage. Weak extension and weak strike- slip controlled development of Liaodong Bay Depression during the Neogene and Quaternary. Conclusions：The superposition and proportion of extensional and strike- slip controlled the temporal and spatial differences of structural deformation in the Liaodong Bay Depression at different development stage. The theory and method we used in this paper can be applied to the basins that controlled by extensional and strike- slip stress in eastern China, especially the area where developed abundant strike- slip derived secondary faults near the main strike- slip faults.