采用玻璃土柱法研究了１２５Ｉ在华南地区砖红壤和水稻土中的淋溶和垂直迁移。结果表明，通过２０ｃｍ土柱后收集到的全部淋溶水中１２５Ｉ的含量，在砖红壤中约占标记量的５２６％，在水稻土中约占１１０５％。淋溶后砖红壤中约８８０３％的１２５Ｉ残留在表层１０ｃｍ内，水稻土中约９２２１％残留在表层１０ｃｍ内。迁移试验结果表明，１２５Ｉ在土柱中垂直迁移２７ｄ后，各层均有分布，但大部分分布在土壤表层，其中砖红壤中有９１６７％的１２５Ｉ分布在表层２ｃｍ以内，水稻土中有８３９８％分布在表层２ｃｍ内。 The leaching and vertical migration of 125I in brick red soil and paddy soil in southern China were studied by glass column method. The results showed that the content of 125 I in all leached water collected after passing 20 cm soil column accounted for about 526% of the labeled amount in brick red soil and 1105% in paddy soil. After leaching, about 8803% of 125 I residue in the brick red soil remained within 10 cm of the surface soil and about 9221% of the paddy soil remained within 10 cm of the surface soil. The results of the migration test showed that 125I migrated vertically in the soil column for 27 days, and all the layers were distributed, but most of them were distributed on the soil surface. Among them, 91.67% of 125I was distributed within 2 cm of the surface of the soil, 83  98% distributed in the surface within 2cm.