Abstract: On the base of analysis of species distributions of heavy metals in solutions with MINTEQA2 computer programme at working condition, Na₂S addition wasused to remove metals from wastewater containing EDTA solution. The results showed that metal ion Cd²⁺, Cu²⁺, Pb²⁺, and Zn²⁺ were main species in the simulatedwastewater without EDTA solution. However, metal-EDTA was found to be predominant fraction among metal species in the simulated wastewater with EDTA solution. Heavy metals Cd²⁺, Cu²⁺, Pb²⁺ were precipitated completely by low concentration of Na₂S from without EDTA solution, and 57.0% of Zn²⁺ was removed. The precipitation percentages of heavy metals decreased with the increasing EDTA concentration. However, the removal of heavy metals increased with increasing Na₂S concentration. At the same condition, the precipitation percentages of Zn by Na₂S addition were lower than those of other metals. According to engineering experimental results, metals and EDTA were separated efficiently by Na₂S addition from the extraction solution. However, high concentration of Na₂S was required to remove all the metals including Zn.