Abstract: The Junggar Basin consists of the Permian-Jurassic back-arc relict basins as the survival of the Carboniferous unfinished closure back-arc basins.During the time of Cretaceous to Tertiary,the foreland basin developed under the compressions and strike-slipings caused by plate movements in the Tethyan tectonic domain.However,the polycyclic superimposed basins controlled over the tectonic framework of the basin and the thermal evolution enlarged the oil/gas prospect in this basin.