The north of Ordos Basin is found to have hosted a series of sandstonetype uranium deposits, which from east to west are Dongsheng, Hangjinqi (Nalinggou), and Daying uranium deposts, etc, suggesting it is China’s the largest and the most potential area for sandstonetype uranium deposits. The research shows that these uranium deposits are of similar geological characteristics and formation environment. Existence form of uranium and mineral characteristics of Ubearing minerals are the important contents in the study of mineralization process, because they provide not only the important basis for insitu leach mining of uranium but also key information on deposit formation mechanism or deposit formation environment of sandstonetype uranium deposits. This study investigates mainly the geological and geochemical features of uranium minerals in sandstonetype deposits (such as Daying and Nalinggou uranium deposits) and their genesis. By means of electron probe and high resolution scanning electron microscope, it can be concluded that the uranium mineral types of uranium deposits in the northern part of the basin are mainly coffinite, with minor brannerite, pitchblende, silicon water coffinite, thorium and uranium stone. Uranium minerals are often associated with pyrite and organic matter (soot) and calcite. The proportion of uranium minerals in the ores was quantitatively studied by sequential chemical extraction. The results show that the uranium minerals and adsorbed uranium account for about 50% of the existing forms of uranium. Uranium minerals of sandstonetype uranium ores were analyzed using insitu LA-ICP-MS REE test for the first time. Our results suggest that ΣREE is highly enriched in coffinite, which is the main carrier for rare earth elements in ores. Rare earth elements are useful components in uranium ores and REE standard curves show obvious rightdipping and LREE enrichment, LREE and HREE fractionation, weak negative δEu and δCe anomalies, indicating that the uranium mineralization formed in the exogenous environment. From the perspective of the above characteristics of uranium minerals, this study discusses the environment and genesis of uranium mineralization. Therefore, it can be concluded that uranium mineralization has experienced a low temperature fluid environment and the uranium deposits formed in the shallow crust, which is not related to the deep source, is the source of the deep crust.