Abstract: The strata with carbonate rock, sandstone and shale in Shuguang buried hills of Liaohe basin were considered as Mesoproterozoic and Neoproterozoic. The discovery of the remained animal fossils in these strata leads to the new point of that Paleozoic layers exist. By study on conodonts, fossil petrology, rock assemblage and logging data, this set of strata is reclassified and described, and the stratum sequence of Cambrian and Ordovician is established. The results indicate that the Paleozoic reservoir exists in Liaohe fault basin. The buried hills are not monocline but a complex faulted block composed of a part of a fold. On this basis, the structural features and distribution of the Paleozoic hydrocarbon reservoir inside the Liaohe basin buried hills can be viewed. In addition, the determination of the Paleozoic in the Liaohe basin extends the distribution of the Paleozoic in Liaoning Province. It is significant in modifying and perfecting the lithofacies paleogeography of the period.