Abstract: The northwestern margin of Tarim plate was a typical passive continental margin during Carboniferous period. Based on the research of sedimentary sequences and relative sea level changes of the Carboniferous in the areas, the various types of sequences boundariesⅠ(SB 1) and Ⅱ(SB 2) can be identified, and then the Carboniferous strata can be subdivided into four two order sedimentary sequences or supersequences, or eight three order sedimentary sequences, which can be correlated briefly in regional and global areas. The mode and quantity of the sedimentary sequences and the change of sea level in different areas can be great different because of the great different tectonics and sedimentary settings.