Abstract: Adsorption of Congo Red by peanut shells was studied with a static adsorption method and effects of dosage and size of peanut shells,pH and initial concentration of Congo Red solution,duration of the incubation and temperature on the adsorption were investigated.Results show that the smaller the particle size of peanut shells,the higher the adsorption capacity of peanut shells,and the longer the duration of incubation,the higher the removal rate of Congo Red.However,the adsorption might basically reach equilibrium in 90 minutes.At room temperature,removal rate of Congo Red reached 91.2% in solution 7.54 in pH.The isothermal adsorption behavior of peanut shells on Congo Red tallied quite well with the Freundlich equation.So that,the peanut shell is an ideal functional material to remove Congo Red through adsorption.