Abstract: Biomass and contents of Cd in the abovegrounds of Sauropus androgynus (L.) Merr.. were determined in this experiment proceeded in the pots, as well as some biochemical indicators , including soluble protein, chlorophyll, membrane permeability in leaves, in which the anylsis of the relationship and Cd concentration in solution was also taken in the experiment that was due to provide a scientifically theoretical basis for the phytoremidiation in the soils contamminated by Cd with S. androgynus. The results presented that Cadmium contents in roots, stems and leaves increased gradually with treated concentrations rising in the experiment, and the change of Cadmium content in root was the most insignificant among them, in which the contents of Cd had all been more than the hyperaccumulators critical value, when the concentration 50 mg/kg was in solution. and when 400 mg/kg, contents of Cd in roots, stems and leaves were up to respectively 6566.00、948.46 mg/kg and 20.39 mg/kg, but 800 mg/kg had resulted in the death of S. androgynus. Under the concentrations of CK-T2, A/R and transfer coefficient were both more than 1, but when concentration reached T3-T6, there was a slight decrease in transfer coefficient. the difference among membrane permeability, biomass and chlorophl was no insignificant on the level of 5% , and contents of soluble protein increased from 0 to 50 mg/kg, the content of chlorophl, biomass and soluble protein, while, fell down when concentration in solution was from 100~400mg/kg, but membrane permeability was on the contrary, the results indicated that S. androgynus was a kind of hyperaccumulator in Cd, with critical value of 50 mg/kg, above which would cause poison in S. androgynus, and even dead when it was up to 800mg/kg; transfer coefficient would decrease with the increase in treated concentrations, which show that plant would protest Cd against transferring to above-grounds and causing poison.