Abstract: Studies were carried out with radionuclide tracer on absorption,distribution and absorption coefficient of rare earth Promethium( ¹⁴⁷ Pm) in three species of aquatic vegetables(arrowhead,water chestnut and water dropwort).The results showed that they displayed a high capacity of absorbing and enriching ¹⁴⁷ Pm. In the case of water dropwort, the absorption of ¹⁴⁷ Pm increased with the growing time. In 50,80 and 110 days,the absorption coefficient of the entire sample was 0.98±0.19,0.92±0.38 and 1.14±0.18,respectively. The edible parts of the vegetables(stems of water dropwort and corms of arrowhead and water chestnut)showed enrichment of ¹⁴⁷ Pm with the absorption coefficient, being 1.29±0.28,2.09±0.03 and 1.55±0.55,respectively.