Abstract: Based on detailed analysis of 3D seismic data, drilling and well logging data, the Cenozoic formation of Liaodong bay depression can be divided into three tectonic layers from the bottom to up: Kongdian-Shahejie formation, Dongying and Guantao formations, and Neogene-Quaternary tectonic layer. They correspond to three structural evolution stages as continental rift stage, rift-depression transition stage and thermal subsidence depression stage. The transition changes of the three evolution stages result in the different structural styles developed in different structural zones: the lower tectonic layers developed NE trending normal faults which controlled the sedimentation and basin basement structure formation, mainly developing stretch structural structure; the central tectonic layers developed NNE strike slip fault, mainly developing stretch and strike-slip structure; the upper tectonic layers developed NE secondary fault, mainly developing weak strike-slip structure.