On the basis of analyzing the depositional ages for rift basin in the eastern Guizhou area in early Neoproterozoic, and the new data about the Sturtian glaciation, the bottom of Nanhuan System, and the geochronology of Qingbaikouan System, writer point out that Neoproterozoic rift basin deposition was not glacial deposition, which was the filling deposition under the condition of Rodinia fragmentation before Nanhuan glaciation, its depositional age was 740~820Ma, that Qingbaikouan System should be the deposition of depression basin under the mechanism of plate collision related to Rodinia formation, and that Nanhuan System was the glacial deposition corresponding to Cryogenian, and was the first sedimentary overlay of Neoproterozoic rift basin in South China. Therefore, they are both not reasonable whether Banxi Group, Xiajiang Group and corresponding deposition was labeled as Nanhuan System or Qingbaikouan System. Under this conditions, writer propose a concept of the Banxi System, which is representative for a set of wedgeshaped strata, such as the Banxi Group, Xiajiang Group, Danzhou Group, Gaojian Group, Dengshan Group, Likou Group and so on in South China. The proposal of the Banxi System will not only benefit to strata correlation of the Nanhuan System, which debated for a long time, but also benefit to the research about the relationship between Neoproterozoic rift basin evolution and Rodinia fragmentation, glaciation formatiom, and the probe into corresponding important problems about climate and environment tremendous changes.