Characteristics of adsorption-desorption of PCP were investigated in red soils and yellow-brown soils.The results showed that isotherm adsorption of PCP was best described by Freundlich and Langmuir equations and the maximal PCP adsorption occurred in yellow brown soils rather than in red soils.Kinetics of PCP adsorption could be fitted by Elovich equation and dual constant equation and first order equation,of which the correlation coefficient (R²) ranged between 0.96~0.99 and reached a significant level.Data fitted by Elovich equation indicated energy distributions of PCP adsorption onto the soil surface were nonhomogeneous.Parabolic diffusion equation could not describ the adsorption process of PCP with R² ranging between 0.46~0.48.Desorption rate of PCP in acidic soils was closely related to contents of Organic Materials (OM) and pH in solution and could be reduced with the increase in OM and the decrease in pH value of the simulated acid rain.