Abstract: This paper briefly introduces the achievements in the study of the multiple stratigraphic classification and correlation-revised integrated stratigraphic regionalization and lithostratigraphic sequence-in western Sichuan.The major achevements are systematic revision of all the lithostratigraphic units,complete elaboration and perfection the lithostratigraphic sequence and establishment of a special lithostratigraphic sequence on the basis of the tectonic junction belts The authors have established the Precambrian Lower Haxa Formation,determined the Yaming Group to be of Early Sinian age and proposed a new idea of assignment of the Jiudingshan stratigraphic area to the Yangtze stratigraphic region.