Abstract: Huahai basin is located in the western margin of Corridor basins in Gansu Province, and is one of the important potential areas for deep uranium exploration. Based on the extraction of radon gas in soil and the information of the field exploration, it is considered that the soil radon concentration in Huahai basin can be divided into normal to high in the east and even higher in the west. The Lower Cretaceous sandstone of Xiagou Formation (K₁x) is the target reservior of uranium deposits in the study area. The authors suggest that the favorable target is in the transition zones and uranium mineralization belt with higher Radon levels in the west and south of the area.