Abstract: In the technology of non-thermal plasma synergistic catalytic treatment of VOCs, the flue gas temperature can affect the system􀆳s operation, thereby affecting the degradation of VOCs. This study investigates the performance of DBD plasma and plasma-catalyst synergy in the degradation of chlorobenzene, the target pollutant, under different conditions of flue gas temperatures (25 - 150 ℃) and in a complex flue gas environment. Performance was evaluated via chlorobenzene removal efficiency, degradation products, energy density, and energy efficiency. Additionally, the structural characteristics and lifespan of the Mn / γ-Al₂O₃ catalyst were examined. The results indicate that an increase in flue gas temperature aids in the degradation of chlorobenzene by DBD plasma, improves energy efficiency, lowers the energy consumption of the system, significantly decreases O3 generation, and enhances CO₂ selectivity. However, mixed flue gas conditions are unfavorable for chlorobenzene degradation. The introduction of the Mn / γ-Al₂O₃ catalyst significantly increased the chlorobenzene removal efficiency, and the flue gas temperature did not affect the catalyst􀆳s lifespan.