This paper discusses the Sinian stratotype section and its stratigraphic sequence. The authors try to set up a stratotype section of the terminal Precambrian in China for a global stratigraphic correlation based on the history and experience summarized by predecessors and the achievements gained in the study of comprehensive stratigraphy in recent years. The study of the Sinian System has a long history and the typical stratotype sec- tion has undergone a long debate between geologists from northern China and those from southern China. There have been several opinions for drawing a clear line to demarcate the upper and the lower boundaries of the Sinian. According to recent studies, the authors still hold that the Sinian section is widely developed, completely exposed and continuous in the area to the eastern gorges of the Yangtze River with dominant characteristics and various features in biota evolution, which can be widely correlated with the terminal Precambrian strata in the globe. At present, the upper boundary of the Sinian is defined below the Tianzhushan Member of the Dengying Formation, where small shelly fossils appear (i. e. the boundary between the Sinian and the Precambrian is set between Zone A and Zone B of small shelly fossils in the Meishucun section in Jinning County, Yunnan Province, with an age of 540 Ma. ). However, there have been so many opinions about the lower boundary of the Sinian in China. Based on this comprehensive stratigraphic study, which incorporates biostratigraphy, chronostratigraphy, sequence stratigraphy, C/O isotope study and sedimentary facies, the authors consider that the lower boundary of the Sinian System should be at the bottom of the deposits of the Doushantuo Period, which is just developed above the Nantuo tillite. Again, the authors propose that this section lying in the Yangtze Gorges should be chosen as the stratostype section of the Sinian System.