本文用连续提取法研究了调节土壤ｐＨ值和加入外源稀土后红壤中稀土元素结合形态的变化。结果表明，调节ｐＨ值后，残渣态仍然为红壤中稀土元素最主要的结合形态。ｐＨ值升高，稀土元素有效性程度降低，施加石灰是抑制其污染环境的有效手段。外源稀土加入红壤后，稀土的结合形态和酸溶态占了很高比例，表明外源稀土在红壤中的有效性程度很高，施用不当有污染环境的潜在威胁。 In this paper, the continuous extraction method was used to study the changes of rare earth elements in red soil after pH adjustment and addition of exogenous rare earth. The results showed that the residue state was still the most dominant form of rare earth elements in red soil after the pH value was adjusted. pH value increases, the degree of effectiveness of rare earth elements decreased, the application of lime is an effective means to inhibit its pollution of the environment. When the rare earths are added into the red earth, the bound form of the rare earths and the acid solution account for a very high proportion, indicating that the availability of exogenous rare earths in the red soils is very high, and the improper application can potentially threaten the environment.