By the study on the Carboniferous biostratigraphy and geological age in Lubaishan,Jiabaishan and Yamansu areas in Jueluotage,the Carboniferous sequence is revised,and the fusulinid zone,coral assemblages and brachiopod assemblages are divided.It is suggested that the geological age of Lower and Middle member of Yamansu Formation is Jiusian-Shangsian in the Early Carboniferous. While the Upper member is Dewuan,and the strata of volcanic deposit which is correlated with the marine volcanic type iron is Jiusian.What’s more,these fossil assemblages indicate that the age of Dikanr Formation is Luosuan in the Late Carboniferous,and the age of Tugutu Bulak Formation is Huashibanian,volcanics horizon here was forming in Huashibanian.Besides,this paper suggests that the Xiaorequanzi Formation should be abandoned since this formation can belong to the Middle-Lower part of Yamansu Formation in this area.The geotectonic background of Carboniferous is also discussed in this paper.