The Awati-Manjiaer(or A-Man) low ridge of the Tarim basin is a special uplift between the Awati and Manjiaer depressions. In a west-east direction, it is a wide, gentle uplift, whereas a depression between the North Tarim and Central Tarim uplifts is in a south-north direction. Its sedimentary formations can be divided into lower, middle and upper structure layers. The lower structure layer consists of the Sinian to the Devonian, in which the A-Man low ridge is observed. The upper structure layer is composed of the Cretaceous to the Quaternary, which shows a large slope dipping northwestward. The middle layer of the Carboniferous to Triassic displays a transitional shape from the lower layer toward the upper. Since the Tarim movement at the end of the Pre-Sinian, the A-Man low ridge has experienced 4 major tectonic evolution stages: the stage of formation of the A-Man low ridge in the period of Sinian to Devonian, stage of reform of the A-Man low ridge in the period of Carboniferous to Triassic, stage of formation of a slope structure dipping northeastward in the period of the Jurassic to Paleogene, and that of the formation of the present structure in the period of the Neogene to Quaternary.