Abstract: The early Cretaceous is an important evolutionary stage of the evolution of the Erlian basin, and the exploration of its tectonic environment and sediment sources has significant implications for the study of the genesis of uranium deposits in the basin. This article focuses on the Bayanhua Formation of the Lower Cretaceous in the Chuanjing Depression of the western Erlian Basin. Through the dating results of detrital zircon LA-ICP-MS U-Pb, it is shown that the lower and upper parts of the Bayanhua Formation of the Lower Cretaceous have different age peaks, with the lower part having a main age peak of 1800～2100 Ma; The upper part of the Bayanhua Formation has a main age peak of 250～330 Ma. Based on the study of plastid chronology in various regions, it is believed that the sedimentary materials mainly come from the Baoyintu Uplift, Sorenshan Uplift, and Langshan Baiyunebo Uplift. Based on the comprehensive drilling logging results, it is believed that the lower part of the Bayanhua Formation in the Lower Cretaceous has a high uranium content, which can be used as the main target layer for searching for sandstone type uranium deposits in the study area and surrounding areas.