Field experiment was conducted to study the enhancement of ethylene diamine disuccinic acid (EDDS) on soil NH₄NO₃ extractable Cu, Zn and Pb concentrations, and Elsholtzia splendens plant Cu, Zn and Pb uptake in a period of two years. Results showed that EDDS addition could improve plant Cu, Zn and Pb uptake by Elsholtzia splendens, but didn't significantly affect the ground water quality. However, the potential environmental risk of EDDS application on heavy metal leaching to ground water may need further monitoring. And the efficiency of chelator-enchanced phytoextraction requires further examination in relation to environmental factors especially rainfall and ground water quality.