The contents,migration and profile distrjbution of natural radioactive elements in main groups of soils of loessial region are described in this paper.The results showed that contents,ratios and variance of radioactive elements in the soils were approaching to those in loessial parent materials.But certain variations were found among the soil groups,(gray-drab forest soil>stratified old manured loessial soil> drak loessial soil) sierozem>cultivated loessial soil>> aeolian sand soil).In alkalescent-oxidative condition of soil,uranium in the form of (UO₂)²⁺ was more active.Carbonate precipitated the luvic migration of U and organic matter fapoured the accumulation of U.Th and Ra accumulated in the soil layers rich in clay particle,but leaching trace of Th existed in the forest soils.In view of profile distribution,biological accumulation of radioactive elements exceeded leaching in the soil forming process.Under different la}iid utilization conditions,anthropic transfer of material intensified differentiation of the content and distribution of radioactive elements in soils.