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Online detection of insulation defects the decomposition products of SF 6 plays a key role in ensuring the safe operation of the gas-insulated switchgear (GIS) equipment. The pristine TiO 2 (1 0 1) modified by Ni cluster (1-3 Ni atoms) is used as a new gas-sensing material to study its gas-sensing characteristics to the characteristic decomposition products of SF 6 : SO 2 , SOF 2 , and SO 2 F 2 . Through density functional theory (DFT) calculation, we found that the modification of Ni clusters significantly improved the conductivity of pristine TiO 2 (1 0 1) and the gas sensitivity of SF 6 decomposition products. More importantly, the change of conductivity after gas adsorption lays a theoretical foundation for identifying the type and concentration of SF 6 characteristic decomposition products and further judging the type of defects in GIS.