The total thickness of the Upper Triassic and Cretaceous are over 10 000 meters around the margin of South China continent. The organic matter is of typeⅡ-Ⅲ. High quality source rocks, which contain 1.17%~5.43% of TOC, were found in the deep marine deposits of the Xiaoshui Formation of Upper Triassic. The Bianqiaoyuan Formation of Lower Jurassic is a transitional facies, where source rocks were found with 1.36%~10.37% of TOC. The source rocks are now matured or over matured. Among them, the source rocks in the Xiaoshui Formation and Lantang Group are the best with regard to the high TOC and big thickness.