Objectives: Sichuan Basin is considered to be one of the most representative continental basins of Cretaceous in China. But there is no evidence of the relevant terrestrial biostratigraphy. In order to understand the characteristics of sporopollen assemblages of the Early Cretaceous red beds in Sichuan Basin and to determine the stratigraphic age and the paleoclimate characteristics of the Cangxi Formation and the Bailong Formation. Methods:The sporo and pollen are separated from the samples by conventional acid treatment and heavy liquid method. Diversity atatistics were also carried out. Results: The Early Cretaceous Classopollis pollen was the first discovered in the Mumen area of Cangxi County, northern Sichuan Basin. It is characterized by a strong dominance of Classopollis pollen and a low diversity of other palynomorphs, exhibits a very high abundance of Classopollis pollen, reaching up to 97%. The palynological assemblage is dominated by gymnosperm pollen, which is followed by fern spores; no angiosperm pollen was observed. The spore assemblage is dominated by CyathiditesandDeltoidospora (averaging 14%),followed by Osmundacidites (average 08%). Conclusions:Although Dicheiropollis has a low abundance of fossils, its stratigraphic distribution data show short- term and sub- layout limits. It is indicated that the Cangxi Formation and the Bailong Formation of the Wall Rock Group in northern part of the Sichuan Basin may be in the Valanginian to Hauterivian Period. According to the genetic relationship of the main sporopollen assemblages, the Sichuan Basin was dominated by a single forest community dominated by Cheirolepidiaceae and a small number of dwarf plants. Arid climate prevails. Based on the discovery of Dicheiropollis. The boundary between the Southeast China Classopollis—Schizaeoisporites Province and the Xizang—Tarim Dicheiropollis Province is moved at least to the east of Sichuan Basin. This indicates that it is likely that the phytogeographic regions along the Paleotethys Ocean are wider than the regions proposed in earlier studies.