Abstract：A set of complete Cambrian dolostone strata was found in Penglaiba section of Keping area，Tarim Basin.Through the detailed field measurements，lithological description，samples collection and slices observation under microscope， an integrated Cambrian stratigraphic column was compiled and analysis of sedimentary facies of these strata were conducted.One kind of facies was identified in the study area：Carbonate platform facies，which can be divided into three subfacies including open platform，restricted platform and evaporative platform.These subfacies include two microfacies respectively.Open platform includes open tidal flat and particles beach;restricted platform includes restricted tidal flat and lagoon;evaporative platform includes evaporative tidal flat and salt lake.The subfacies and microfacies were analyzed，and three facies models were established: Open platform model，restricted platform model and evaporative platform model.The microfacies of these three kinds of platforms turned to be interactivly deposited showing some rhythms.The vertical evolution of the sedimentary environment of the Cambrian in the study area reflects the relative sea-level changes as rising-falling-rising tendency.
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