Abstract: The evolution characteristics of sedimentary system and facies of Carboniferous - Permian in western Tarim basin were systematically analysed on the basis of more than thirty outcrop sections, along with drilling and seismic data. It is suggested that Carboniferous ~ Permian is a complete pericxi of transgression - regression cycle, where carbonate and clastic rock amalgamated in early period of transgression and late period of regression. Tliree sedimentary systems were divided regarding Carboniferous - Permian： Lower Carboniferous(including lower part of Lower Permian in very few areas) amalgamated continental shelf; Upper Carboniferous - lower Lower Permian carbonate platform, and upper Lower Permian - Upper Permian terrestrial clastic, sedimentary facies maps of seven periods were made. An attempt to reconstruct paleotemperature and paleogeography settings was made according to the experimental results of carbon and oxygen isotope, and trace element.

Key words: Tarim basin, West, Carboniferous, Permian, Sedimentary system, Sedimentary facies, Paleoclimate, Paleotopgraphy, Paleotemperature