Abstract: Abstract：On the basis of regional geologic survey that the authors have carried out for a long time in Jiangxi Province, this paper puts emphasis on the investigation of lithostratigraphic sequence and the subdivision and correlation of ages of the epimetamorphic strata of Meso-Neoproterozoic folded basement before Sinian as well as three suites of complex strata such as the late period of Qingbaikou System and Nanhua System through the collection and study of the relevant geological data in combination with the utilization of the methods of correlation and analysis of structure, lithologic assemblages, key horizon succession and isotopic dating data. The results show that the differences of the stratigraphic lithology between Jiangnan continental margin, South China oceanic basin and metamorphic basement of Huaiyu island arc is apparent, suggesting that the age of the former may be later than that of the latter. On such a basis, this paper puts forward a new opinion on the main characteristics of the arc-basin system of the early Neoproterozoic period and the rifting system of the late period of Qingbaikou System, In addition, their development and evolution are also discussed.