In view of the small scale and the scattered distribution characteristics of the Lower Jurassic reservoir in Ordos Basin, the identification sign of sedimentary facies in Wuqi area of Ordos Basin was defined based on the core observation and log analysis. The result shows that the Fuxian Formation is of braided river sedimentary system, and developed sedimentary microfacies such as braided channel, diara, natural levee, flood plain and so on. At the same time, the sedimentary model of braided river is built up under the background of erosion in the river valley. Based on the research on sedimentary facies and sand thickness, the paleogeomorphology background of the Fuxian Formation was restored. The result shows that Ningshan ancient river and Mengshan ancient river intersected in Wuqi area, and formed a ancient hill among the rivers. The secondary river channel in the ancient river channel slope was also despcribed, which is of great significance for looking for the distribution laws of reservoirs under the control of the sedimentary facies in the Lower Jurassic.