The paper employed liquid reduction and carbothermal methods to synthesize nano zero-valent/activated carbon composites so as to compare the impact of different synthesis methods on products' physicochemical property and dechlorination capability.With the loading of iron, the surface area and pore volume of synthesis material decrease compared with unchecked activated carbon.The iron rate of materials synthesized from liquid reduction and carbotherml method is about 12.85 and 16.73 mg/g respectively. TEM images showed that the size of nano zero-valent iron particles produced from carbotherm reduction is greater than those from liquid reduction and better dispersed.Both materials synthesized by two methods have good removal effect to hexachlorobenzene. Removal rate reaches more than 90% after contact of 8 hours. Kinetics study further revealed that hexachlorobenzene removal fits the pseudo-second order reaction well. The removal of hexachlorobenzene result from both adsorption by activated carbon and dechlorination by zero valent iron. About half of the initial hexachlorobenzene is dechlorinated to trichlorobenzene or tetrachlorobenzene.Overall,the performance of the material synthesized by carbothermal treatment is better than that synthesized by liquid reduction in light of removal efficiency, reaction rate and dechloriantion capability.