通过研究新疆阿克苏巴楚地区寒武奥陶系沉积特征、层序地层序列及其海平面变化规律，首次识别出２个二级旋回层序、４个三级旋回层序和９个四级旋回层序。重点对三级旋回层序的层序界面性质及其体系域特点进行了深入、细致的分析。研究表明，每一旋回层序的形成，理论上均由海平面相对快速上升、缓慢上升、静止、缓慢下降和快速下降所引起，但实际情况较之复杂。海平面上升的最大幅度发生在丘里塔格晚期—吐木休克早期，之后由于构造运动和全球海平面下降，该区海平面亦快速下降，海水迅速退出本区，致使该区普遍缺失上奥陶统 By studying the sedimentary characteristics, sequence stratigraphy and sea level variation of Cambrian-Ordovician in Aksu-Bachu area, Xinjiang, two second-order cycles, four third-order cycles and 9th-four cycles Cyclical sequence. The emphasis is put on the detailed and thorough analysis of the sequence boundary properties and its system traits of the third-order cycle. The study shows that the formation of each cycle is theoretically caused by the relative rapid rise, slow rise, quiescence, slow decline and rapid decline of sea level, but the actual situation is rather complicated. The most significant sea level rise occurred in the early Quri Targ-early Tumon shock. After that, due to the tectonic movement and the global sea level drop, the sea level in the area also dropped rapidly and the seawater rapidly dropped out of the area, resulting in a general absence of the upper Austria Tao system