Based on former drilling data and our field investigations, writers studied the sedimentary environment, paleogeographic characteristics, sandstone bodies' thickness and spacial distribution of the Xishanyao Formation, which is the goal layer of prospect. Based on the epigenetic oxidation degrees of various layers of the Xishanyao Formation, the distribution and spacial shape of interbedded oxidation zone were ascertained. The sandstone petrological and petrochemical characteristics of the goal layer suggests that there are close relations between sandstone porosity, density and its texture-construction, and that the variations of the secondary minerals and the contents of chemical elements such as Fe, CO2, C (organic carbon), S, U, Th, Se, Mo, V et al. are closely related to the oxidizing action of groundwater, and agree with the variation rules of aqueous uranium deposit. Based on the studies above, the oxidated sand body was confined, which has the depth of bottom footwall of less than 300m and the thickness of 50-100m. The length of the oxidation zone front is up to 60 km. Many uranium mineralization and selenium mineralization points were found in the oxidation zone front. Therefore, it is suggested that the region has good prospect for the uranium deposits of sandstone-type.