Abstract: To save the cost of thermal desorption for remediating contaminated soils, the feasibility of removing HCB in thermal desorption offgas was investigated by cement kiln in the laboratory under different operating conditions of temperature, initial ρ(HCB), φ(O₂) and gas residence time. The removal rate of HCB increased with increasing temperature and residence time. The removal rate of HCB was over 99.93% when the offgas was treated at ≥800 ℃ with a residence time of ≥2 s. When treated at 900 ℃ for 2 s, ρ(HCB) in the offgas were 0.60,0.78, and 1.50 μg/m³ when the initial ρ(HCB) were 1.70,7.00 and 85.00 mg/m³, respectively, which was not proportional to initial ρ(HCB). This suggests that initial ρ(HCB) slightly affects the removal rate of HCB. φ(O₂) was also found to have little effect on the removal rate of HCB when φ(O₂)≥2%. Pentachlorobenzene was the only dechlorination product of HCB; the highest concentration of pentachlorobenzene was 1.20 μg/m³ after the treatment. The PCDD/Fs concentrations in the offgas after the treatment were lower than the standard for pollution control on co-processing of solid wastes in cement kiln. These results indicate that HCB in thermal desorption offgas can be effectively removed by simulated cement kiln.