Abstract: Seedlings of mangrove plant, Kandelia candek, were growed in sea water with 0.0025-25ppm Cd in sand culture. The main results showed as follows: The Cd contents in the different organs were: root>hypocotyl>stem>leaf. The Cd contents in the organs (y) increased with the increasing of Cd concentrations in the culture solution (x) and relationship between y and x was doubly logarithmic regression equation, eig., the equation of root Cd content and that of culture solution was: log(y) = 1. 8039 + 0.4311 log(x) showing a greatly significant relation. The Cd enrichment ratios in different organs of the seedling were 62.4 for leaf, 113.6 for stem, 187.2 for hypocotyl, 705.2 for root respectively in the solution treated with 2.5ppb. The amount of Cd accumulated was 239.47μg per seedling(mean d. w. 6.18g) treated with 25ppm for 4 weeks and 75.6% of which was in the roots. 2.4--36% of Cd added to culture solution were absorbed by the seedlings in all treated groups for 4 weeks. The Cd content in the root treated with 2.5ppm Cd for 10 weeks was 538.74μg/g but the seedlings had not been injured apparently, so that K candel could play an important role in absorption and removal of Cd from the soil of coastal swamp.