塔里木盆地奥陶系出露于盆地周缘并在覆盖区主要构造单元钻遇。覆盖区奥陶系包括台地相、斜坡相和槽盆相三大类型；含有冷水型和暖水型牙形石化石及珊瑚、笔石、三叶虫和几丁虫等化石，共划分出57个带或组合。根据多门类化石将盆地奥陶系诸多岩石地层单元的时代、中-上奥陶统和寒武系界线进行标定；分别对各构造单元内部及全盆地奥陶系各地层单元进行对比；指出盆地内存在相带变化、奥陶系内部地层间断等问题。 The Ordovician in the Tarim Basin is exposed at the periphery of the basin and encounters major tectonic units in the coverage area. The area covered by the Ordovician includes three major types of platform facies, slope facies, and basin basins; the fossils containing cold water and warm-water type conodonts, corals, penoliths, trilobites, and chitin, Belt or combination. Based on multi-class fossils, the age, Middle-Upper Ordovician and Cambrian boundary lines of many Ordovician stratigraphic units in the basin were calibrated. The Ordovician stratigraphic units within each tectonic unit and the whole basin were compared respectively. In the phase belt changes, Ordovician strata and other internal problems.