The Tian’e carbonate platform in Northwestern Guangxi, formed in the late period of Early Devonian and demised in the end of Early Triassic, was surrounded by deep sea trough during Late Paleozoic. It is a typical isolated carbonate platform in the northern part of the Youjiang Basin，and the stratigraphic and sedimentary characteristics of the Upper Paleozoic are mainly controlled by the base subsidence, sea level fluctuation, as well as changes of the carbonate deposition rate in the basin. Two facies regions and six kinds of sedimentary facies can be identified, mainly comprising isolated platform facies region, slope basin facies region, and restricted platform, semi restricted platform, open platform, platform margin, front slope of carbonate platform and basin between platforms facies, respectively. Palaeogeography in different periods have obvious inheritance and development, so a related depositional model for the isolated platform can be established. The current study suggests that it experienced four evolutional stages, namely, embryonic stage (D31— D2) , forming stage (D3), sustained development stage (C1—P2) and atrophy foundering stage (P3—T1), which correspond to the process of Youjiang Basin evolving from rifting basin (D31—D3) to passive continental margin (C1—T1) with intense expansion and subsidence, while the southern margin of the Yangtze Platform experienced extension and breaking splitting.