Pot experiment was conducted to study the effects of EDTA and organic acids with lower molecular weight on the properties of soil solution,the form distribution of Cu in the soil and Cu uptake by Indian mustard(Brassica juncea).Results showed that the total concentration of Cu and especially the nonlabile Cu in soil solution significantly increased after the addition of 3 mmol Kg^-1 of EDTA,it had a good relationship with the total organic carbon (TOC) in the soil solution.EDTA increased the contents of NH₄NO₃-extractable and NH₄OAc-extractable in the soil solid phase.The addition of EDTA did not affect the growth of Indian mustard,but significantly increased the concentrations of Cu in the leaves,stems and roots of the plants.Therefore,the Cu uptake by Indian mustard was greatly enhanced and the remediation efficiency improved signficantly.The addition of 3 mmol Kg^-1 oxalic acid,citric acid or malic acid had no effect on the Cu concentrations in different fractions in the aqueous and solid phase of soil,and on the plant growth and Cu uptake by Indian mustard.