Abstract: The South Yellow Sea Basin is not only the seaward extension of the Yangtze Platform, but also the main part of the Lower Yangtze Platform. The Mesozoic-Paleozoic marine sequences there is similar to those in the Sichuan Basin and the oil-gas bearing horizons are accordant with those in the large oil-gas fields in Sichuan Basin, such as the Weiyuan, Anyue, Wubaiti, Puguang and Longgang gas fields. There are three sets of source rocks and three source-reservoir-cap assemblages in the South Yellow Sea Basin. The Laoshan Uplift is the most promising region for oil and gas prospect in the marine Lower Paleozoic, while the Wunansha Uplift is the most promising region for oil and gas prospect in the marine Mesozoic-Paleozoic.