The study in Yinggehai and Qiongdongnan basins confirmed that South China Sea and its adjacent areas can be divided into collision-extrusion tectonic province and proto-SCS slab pull tectonic province. In this paper, the authors clarify distinct structure features, different evolution history and dynamic settings of the two tectonic provinces.They are bounded by a transform boundary of Red River fault extended south along the Vietnamese margin and joined with the trench along the Lupar Line. Considering the dynamic deformational division, the dynamic mechanisms and their evolution models for Yinggehai and Qiongdongnan basins have been clearly determined.