Five sedimentary facies types have been distinguished according to 6 studies of the lithologi-cal associations, fossil assemblages and vertical sequence of the rocks at 6 Carboniferous sections in the studied region. They are terrigenous clastic tidal-flat deposits, deltaic deposits, open-platform shallow-water carbonate deposits, restricted platform very shallow-water carbonate deposits and bathyal-water platform-basin deposits. The studies demonstrated that there were appreciable differences in depositional environment associations during different epochs of the Carboniferous : a clastic tidal flat-deltaic-open platform-platform basin environment association pattern may be previaled during the early stage, and a restricted very shallow-water platform environment during the middle and late stages, showing the features of shallowing-upward environmental evolution generally. The shallowing-upward mechanism is considered to be caused by rapied deposition of carbonate sediments in the general setting of progressive overlap.