Objectives：Mesozoic structural deformations in Dongsha Waters are very complicated and their genetic remain some controversies because of stacking of multiple tectonic movements. Methods: Using a highresolution seismic database from southwestern Dongsha Waters in recent two years, through the investigation of the main tectonostratigraphic boundaries of Mesozoic and Cenozoic in Chaoshan depression, with the timetodepth conversion formulas of Mesozoic and Cenozoic, we recognize three types of fold deformations.Results: Three types of fold deformations include a compression anticline A, a rollover anticline B and a bending anticline C. Based on regional tectonic events, three representative patterns of fold deformations occurred during the different stages of depression were proposed. Conclusions: The compression anticline A is inferred to have been the farfield impact of the Late Cretaceous subduction of the protoPacific. The rollover anticline B is more controlled by huge Paleogene subsidence and extremely rifting extension in continental margin. The bending anticline C may be related to the intense thermo subsidence occurred in Neogene deepsags.This research results will assist greatly in revealing a complicate dynamic process and in predicting structural traps of preCenozoic residual basin.