Walnut-shell activated carbon (WSAC) supported ferric oxide was modified by non-thermal plasma (NTP),and the removal efficiency for hydrogen sulfide over Fe/WSAC modified by dielectric barrier discharge (DBD) was significantly promoted.The sample modified for 10 min and 6.8 kV output (30 V input voltage) maintained 100％ H2S conversion over a long reaction time of 390 min.The surface properties of adsorbents modified by NTP under different conditions were evaluated by the methods of X-ray photoelectron spectroscopy (XPS),Brunauer-Emmett-Teller (BET) analysis and in-situ Fourier transform infrared spectroscopy (FTIR),to help understand the effect of the NTP treatment.NTP treatment enhanced the adsorption capacity of Fe/WSAC,which could due to the formation of micro-pores with sizes of 0.4,0.5 and 0.75 nm.XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment,and lattice oxygen is beneficial for H2S oxidation.From the in-situ FTIR result,transformation of the reaction path on Fe/WSAC was observed after NTP modification.The research results indicate that NTP is an effective method to improve the surface properties of the Fe/WSAC catalyst for H2S adsorption-oxidation.