In recent years, the authors discovered numerous the Late Ordovician agnathan fossils in the Yijiangfang section, Bachu County, Xinjiang. The occurrence of these fossils is of great significance for understanding the evolution of the early vertebrates from the Ordovician to the Silurian—Devonian. This paper is focused on the systematic biological description of some fossils, other material will be described and studied in the future.