Abstract: In the paper, geologic structure of the Southern Yellow Sea and the adjacent areas is synthesized on the basis of the search of the predecessores. This region consists of the blocks and the conjunct zones, and undergone a long time and complex development history. Geologic structure relation between east and west sides of the Southern Yellow Sea is not as simple as visualized scenes. The Southern Yellow Sea-East Sea fracturc-magmat rock zone stratching in NW-SE could has acted as the importment contributory in the region.