Abstract: The Nanhuaan section with successive good sedimentary record is situated in Lijiapo, Congjiang County, Guizhou Province. The section is characterized by well-devoloped stratigraphy, continuous deposition, maximum thickness, obvious stratigraphic criteria, clear boundary of top and base. Its internal rock units are respectively Chang'an Formation, Fulu Formation and Lijiapo Formation from bottom to top. The division boundary between them is clear, and can be identified and correlated easily in region. The Nanhua System is conformity with the Longli Formation of Xiajiang Group, Qingbaikouan (underlying) and Doushantuo Formation, Sinian (overlying) in the section. This section is a perfect location for studying "snowball event", and it has recorded perfectly sedimentary evolution in Nanhuaan Large Glaciation age (includes Chang'an glaciation, Fulu-Datangpo interglacion and Nantuo glaciation).