In order to clarify the stratigraphic age of ore- bearing of sandstone- type uranium deposit in the Zhungashun area of Chuanjing depression, Erlian basin, coal seam and dark gray mudstone samples in the borehole were collected in this study to carry out palynology research. The sporo- pollen of ore- bearing strata has the characteristics of Cicatricosisporites- Cyathidites- Abietineaepollenites- Pinuspollenites- Classopollis assemblage, which indicates that the stratigraphic age is the Apthian to Albian of Early Cretaceous. Combined with the U- Pb age spectrum analysis of detrital zircons, it is considered that the main sedimentary provenance of the sedimentary period came from the Baoyintu Rock Group of the Bayinhanggai uplift in the southeast, and a small part came from the ophiolite tectonic melange of Solunshan uplift in the north. According to the statistical analysis of palynological vegetation types, climatic zone types and dry- humidity types in the Zhungashun area, the ancient vegetation was dominated by coniferous, followed by evergreen broad- leaved forest, and a certain number of shrubs and herbs. Spores and pollen of Pinaceae, Dicranopteridaceae and Selaginellaceae are mixed with tropical- subtropical plants such as Cephalotaxaceae, Cyatheaceae and Encyclopedia, indicating that the palaeoclimate was humid subtropical climate. Although the number of hygrophytes in the Baiyanhua Formation increased, the number of xerophytes such as Classopollis and Jugella increased significantly, while coniferous and evergreen broad- leaved forests decreased, indicate a trend towards semi- arid climate. The mud- sand- mud stratigraphic structure of the Baiyanhua Formation in the Lower Cretaceous is stable. The sand body with good permeability and high reduction components is a favorable prospecting target layer, which provides rich organic matter and good preservation space for the reduction and precipitation of uranium- bearing fluids.