The Balang Formation is exposed completely at Jiaobang section, Jianhe County, Guizhou Province, and contains abundant trilobites, including corynexochid 5 genera and 7 species, in addition, redlichid 1genus and 3 species, and ptychoparild 1genus and 1species yielded. Of which Arthricocephalus chauveaui Bergeron，1899，Changaspis elongata Lee in Chien,1961，Arthricocephalites jishouensis Zhou in Zhou et al.,1977 also occur in the lower Cambrian Henson Gletscher Formation of Greenland,which provides significant information for global correlation . A. chauveaui firstly appears at 4m above base the Balang Formation range to 278m of the upper part of the formation at Jiaobang section. New data from lithostratigraphy, biostratigraphy and chronostratigraphy of Jiaobang section of the Balang Formation indicate this section more suit to be as the standard sections of lithostratigraphy of the Balang Formation. It should be the standard stratotype section of boundary for constraining the base of Duyunian (Cambrian) defined by the FAD(First appearance datum) of A. chauveaui in Soth China. It may become a potential proposal stratotype section of boundary defined by the FAD of A. chauveaui for the global Cambrian Series 2 stage 4.