Eight soil profiles in soils derived from purple-red sand rocks at different time periods in south Anhui Province were identified and classified according to the keys to the Chinese Soil Taxonomy (CST) (the 3rd edition).The placement of 2 taxa,the eight soil profiles were formerly sorted into on the subgroup level in the Chinese Soil Genetic Classification (CSGC),in CST was elucidated in the paper.All these soils studied are classifed into 3 CST Orders: Isohumosols,Cambosols and Primosols,3 CST Suborders: Udic Isohumosols,Udic Cambosols and Orthic Primosols,4 CST Group and 6 CST Subgroups.With CSGC-Purple 2 Soil as object for classification,references between the CST,the U.S.Soil Taxonomy (ST) and the World Reference Base for Soil Resources (WRB) were discussed.Environmental conditions for development of Isohumosols from purple-red sand rocks in south Anhui Province were also studied.Meanwhile some amendments were suggested of the Keys to the CST in classifying CSGC-Purple-Soils.