Abstract: The absorption of benzopyrene in octane solution by rosin starch ester was studied in this paper.Affect factors including temperature,contact time,initial concentration of benzopyrene and the degree of substitution (Ds) of the rosin starch ester were investigated.The thermodynamics and kinetics of the absorption process were also studied.The results showed that increasing the absorption temperature,the benzopyrene concentration,and the Ds of the adsorbent were beneficial to the adsorption process.Using rosin starch ester (Ds=0.12) as adsorbent,absorbing 120 min at 50℃ in 10 mg/L benzopyrene,the absorption capacity of benzopyrene reached to 20.76 μg/g.The measured results were fitted with the Langmuir isotherm better.Thermodynamic parameters ΔGØ,ΔHØ and ΔSØ indicated that the adsorption process was spontaneous and endothermic.Analysis of the kinetic data suggested the pseudo second order kinetic model was suitable for describing the adsorption process.