The primary gray sandstone of the Middle Jurassic Zhiluo Formation in the northern Ordos Basin is characterized by high uranium content. Uranium extracted from the syndepositional Urich sandstone through oxidation was the key source for uranium mineralization. In this paper, UPb detrital zircon geochronology, heavy mineral analysis and paleocurrent analysis were used to document sediments sources of the Middle Jurassic Zhiluo Formation in the northern Ordos Basin and to understand the origin of the Urich sandstone. The results show that UPb ages of the detrital zircons from the Zhiluo Formation concentrate on four groups: 251~308Ma, 322~354Ma, 1529~2182Ma and 2200~2632Ma. Heavy mineral assemblages of Mnrich ilmenite, zircon, apatite and titanite suggest intermediatefelsic magmatic rocks were the main source rocks. Comparative study of potential sources shows that the Zhiluo Formation in the study area was derived mainly from NeoarcheanPaleoproterozoic magmatic and metamorphic rocks and late Paleozoic magmatic rocks in the WulashanDaqingshan area and the eastern Langshan area. Statistical analysis of uranium contents from source rocks shows that the late Paleozoic intermediatefelsic magmatic rocks are extremely enriched in uranium than other types of rocks, which caused the formation of the primary Urich sandstone in the northern Ordos Basin. Late Paleozoic magmatism was related to the subductioncollision evolution of the PaleoAsian Ocean. The distribution of the late Paleozoic magmatic rocks possibly controlled the distribution of preore uranium concentration and formation of the uranium deposits in the Central Asia uraniferous province and can be an important factor for the uranium exploration of other basins in this uraniferous province.