Abstract:The distribution characteristics of radon concentration and health risk evaluation in urban soil were studied, which fills the gap in the radioactive field of urban geological survey and provides basic data for guiding urban development and construction. Using GIS analysis technology, the study area was divided into three investigation scales: specific regional type, linear type and regional type, and the soil radon risk assessment was carried out by applying geo-accumulation index method, Nemero index method and potential ecological hazard index method. The results show that: 1) By using geo-accumulation index, Nemero index and potential ecological hazard index to measure the health risks, the pollution level and pollution index of the whole region are (clean, -0.287), (light pollution, 2.585) and (high ecological hazard, 103.42), respectively, and the soil radon pollution degree of each scale of the survey subjects is sorted as: the whole geological body > the whole region> autumnal long structure> the sand field structure> the autumnal long community vacant land; 2) The soil radon health risk levels at different investigation scales are basically consistent with the geo-accumulation index, Nemerow index and potential ecological hazard index, which can be used as an effective method to evaluate soil radon health risk.