Abstract: The study area experienced the whole process of evolution from the passive to active continental-margin trencharc-basin systems on the northern margin of the central Tianshan old land in the Early Cretaceous. The Aqishan-Yamansu island-arc belt occurred on a wide continental shelf sea in the Visean Stage. The island arc has a large antiform structure, the Yamansu fault belt is a main conduit for volcanic eruption, and the forearc basin was formed in an arc-trench gap. In the early Late Carboniferous, collapse due to spreading .in the back-arc area led to the formation of a synformal marginal basin. At the end of the Late Carboniferous, the Kanggur Ocean on the northern side closed in the form of arc-arc junction, accompanied by emplacement of granitic magma in the arc area. The early Lower Permian was a relaxation stage, when an overlapped downfaulted basin formed in the interarc area and on the southern margin of the back-arc area. In the Late Pennian, the right-lateral strike-shp motion swept the whole region. Finally, tight-lateral slip displacement took place between the large-scale orogenic belt and the block, thus giving rise to the initial basin-range framework as now.