The effect of additives including milk vetch,CaCO₃ and bentonite on the toxicities of copper and cadmium in soil extracts and their forms were emphatically discussed in the present paper.The ezperimental results demonstrated that of the three additives,CaCO₃ howed an extraordinary ability to lower the contents of water-soluble Cu and Cd and extractable Cu and Cd with 0.1 mol/L HCl eatractant as well as their toxicities in red soil,and it could make the 6sad Cd in red soil transform obviously from water-soluble and exchangeable forms into organit,Fe and Mn oxides occluded and sulphide forms.In other words,CaCO₃ could chapge the available forms of metals into slowly available and unavailable forms,resulting in the elimination of the toxicities of Cu and Cd in water and acid extraction solutions.