Abstract: The observation under microscope of 105 petrographic thin sections from the Upper Carboniferous Biegentawu Formation in Kake area, Xinjiang identified 6 microfacies: MF1 lime marl, MF2 bioclastic lime marl, MF3 bioclastic wackstone, MF4 bioclastic pelletoid limestone, MF5 sparry bioclastic limestone and MF6 bioclastic rudstone. According to the types of microfacies assemblage, we deduce that this area experienced three sedimentary environments of open platform-platform margin-platform margin slope which is a complete transgression-regression progress.