Abstract: The modified diatomite was prepared using natural diatomite.Adsorption effects and conditions of modified diatomite were studied for heavy metal ions such as Pb²⁺、Cu²⁺ and Zn²⁺ under the condition of static state.The condition of desorption of modified diatomite was also discussed as well as regeneration.After electroplating wastewater containing Pb²⁺,Cu²⁺ and Zn²⁺ was adsorbed by modified diatomite,the contents of Pb²⁺、Cu²⁺、Zn²⁺ in wastewater were prominently lower than discharge standard of China.