Adsorption characteristics of P-Chlorophenol on Activated Carbon Fiber (ACF) and Granular Activated Carbon (GAC) were investigated.The influence of initial P-Chlorophenol concentration on rate of adsorption was studied. The adsorption rate of activated carbon fiber was much higher than the granular activated carbon. The kinetic coefficients of adsorption process of P-Chlorophenol on each carbon were determined experimentally and used in the model to predicted the adsorption. The adsorption prediction on ACF required a modification of adsorption amount (q_m) of Freundlich's equilibrium adsorption to predict accurately in the model used.