On the basis of field investigation, this paper expounded the main environmental geological problem of a uranium ore field. According to the ratio analysis of gamma radiation dose rate monitoring results of fields, main roads and water systems, the environmental influence in this area was analyzed and evaluated. The radioactivity of some proved uranium deposits (spots), uranium mining areas and tailings of hydrometallurgy was monitored and analyzed. The paper analyzed and evaluated the relationship between geological environment and radionuclide content in environmental media in a uranium ore field. In view of the existing radioactive environmental problems, the measures and suggestion for strengthening environmental protection was put forward for rational development and utilization of natural resources in the area.