The Junggar,Tarim and Turpan-Hami Basins with total area of 73.8×10
4 km
2 belogn to superimposed composite basin.They underwent six evolution stages in Paleozoic and Meso-Cenozoic cycles,having different Qinds of unconformities and a variety of structural styles.The distribution of oil and gas is controlley by ancient uplift ancient slope,regional unconformities and kinds of primary generations of structural types.