尽管松辽盆地青山口组沉积时期介形类化石的属种相同或相近，但在不同的沉识相区介形类的发育、繁盛和化石的埋藏、保存有着显著差异。依据松辽盆地北部百余口并中的化石资料，研究了介形类化石的种属数量、丰度、分异度、壳体颜色、单双壳比例、壳内充填物及在地层中保存状况等特点，探讨上述特点与沉积环境的关系。说明湖生介形类不仅受生存条件的制约，其化石保存也受沉积环境的控制。进而可以根据介形类化石的埋藏、保存指明沉积环境，为古地理环境恢复提供有力的佐证 Although the genera of the tectonic fossils in the Qingshankou Formation in the Songliao Basin are the same or similar, the development, flourishing and fossil burial and conservation of the ostracods in different sedimentary facies have significant differences. Based on the fossil data in the northern part of the Songliao Basin, the species, abundance, differentiation, shell color, bivalve proportion, the filling in the shell and the preservation in the formation were studied Status and other characteristics of the relationship between the above characteristics and sedimentary environment. It shows that the habitat of lake habitat is not only restricted by the living conditions, but also its fossil preservation is controlled by sedimentary environment. Furthermore, according to the burial and preservation of the ostracod fossils, the sedimentary environment can be specified to provide a powerful evidence for the restoration of the paleogeographic environment