Abstract: For studying the effect of restoring cadmium-contaminated soil by using oxalic acid elution combined with Sedum alfredii hance， a test was performed by using Sedum alfredii hance combined with oxalic acid chosen from the roots secretion of mine ecological Sedum alfredii hance as an eluent. After four times of soil elution tests were doned by using four different concentration oxalic acid solutions， it was shown that when the concentration of oxalic acid was 25mmol/L， the maximum dry weight of Sedum alfredii hance and the most abundant cadmium on the ground were obtained. The total mass removal rate was the biggest， which could arrive at 51.34%， and it was higher than the group of no elution for 35 percent points. The test results showed that the effect of restoring cadmium-contaminated soil was the best when using the 25mmol/L concentration oxalic acid combined with Sedum alfredii hance. This test results can prove that the oxalic acid combined with mine ecological Sedum alfredii hance has a significant effect in the cadmium removal to restore cadmium-contaminated soil， and the ecotype Sedum alfredii hance grows healthy as well. Scientific proof is provided for the promotion and application of the restoring technology of cadmium-contaminated soil by using oxalic acid combined with Sedum alfredii hance.

Key words: cadmium contamination, Sedum alfredii hance, mine ecological, oxalic acid, elution