Abstract: In order to explore a new industrial application of thermal desorption off-gas treatment technique, pulsed corona discharge plasma was applied to remove DDTs in thermal desorption off-gas. The effects of pulse peak voltage, pulse frequency, inlet concentrations and residence time on DDTs removal rate were investigated. The degradation products of DDTs after the treatment were also analyzed. The DDTs removal rate increased with the increase of the pulse peak voltage, the pulse frequency and the gas residence time. The DDTs removal rate decreased with the increase of ρ(DDTs), but the removal quantities of DDTs increased with the increase of ρ(DDTs) in the feed gas. DDTs removal efficiency was 82.5% when 30.0 mg/m³ of ρ(DDTs) in off-gas was treated for 10 s at pulse voltage of 30.0 kV and pulse frequency of 50 Hz. After treatment, ρ(p, p'-DDT), ρ(o, p'-DDT) and ρ(p, p'-DDD) in off-gas decreased, but ρ(p, p'-DDE) increased. In addition, DM, BH, DDM, DBP and DDMU with low contents were detected as the degradation products of DDTs. In conclusion, the pulsed discharge plasma is characterized as high removal efficiency, which can effectively remove thermal desorption off-gas containing DDTs.