Abstract: Three kinds of biochars (BCs) were prepared from peanut shell, rice straw and corn stalk, and further into three kinds of composites of the corresponding biochar-loaded with nano zero-valent iron (BC/nZVI), separately, of which physic-chemical properties and structures were characterized with BET and SEM, respectively. Moreover, effects of the BC/nZVI reductively degrading γ-benzene hexachloride (BHC), a typical organochlorine pesticide (OCP) in aqueous solutions were determined. Results show that peanut shell, rice straw and corn stalk pyrolyzed at 300℃ turned out the highest amounts of BCs, which were high in adsorption capacity. The prepared BC/nZVI appeared to be in spherical particle, and the one prepared out of peanut shell was the highest in dispersivity. In aqueous phase experiments, BC/nZVI was much higher than BC or nZVI in effect of removing γ-BHC. Among three kinds of composites, the peanut shell based BC/nZVI was the highest in γ-BHC removal rate, reaching up to 87.53% in aqueous solutions for six hours and had the total pollutant degradation rate reach up to 82.33% in the reaction system.