本文以大量的实际资料为依据，阐述了毒性金属形态变化与岩土饱水性的关系，提出了在非饱和环境的岩土中．毒性金属以残余态为主要存在形式，而在饱水环境中．以非残余态为主，而且碳酸盐结合态、中等还原结合态和有机态结合含量均大于非饱和环境岩土中相应形态含量的观点。这一研究成果对于治理Cd等毒性金属对环境的危害具有重要意义。 Based on a large amount of actual data, this paper expounds the relationship between the morphological changes of toxic metals and the saturation of rock and soil, and puts forward the proposal in the geotechnical conditions of unsaturated soil. Toxic metals in the residual form as the main form, while in a saturated water environment. Mainly in non-residual state, and the contents of carbonate-bound, medium-reduced bound and organic bound are greater than the corresponding morphological contents in unsaturated soil. The research results for the treatment of Cd and other toxic metals harmful to the environment is of great significance.