Abstract: This paper studies the sorption behavior of ²³⁹Pu in phyllitic slate and soil. The samples of phyllitic slate and soil in research area were taken for investigation of the sorption characteristics of ²³⁹Pu by static experiment. The liquid-to-solid ratio influence experiment shows a positive correlation between the K_d of ²³⁹Pu and liquid-to-solid ratio. Different cations and anions influence experiment shows that when the concentration of the carbonate ions increases, the distribution coefficient declines. Freundlich isothermal adsorption equation can describe the adsorption behavior of ²³⁹Pu in the phyllitic slate and soil.