SF_6 has a high global warming potential (GWP),and will be harmful to the environment if the SF_6 is discharged into the atmosphere without treatment.The SF_6 is more extensively applied in the power industry and the exhaust emissions are also increasing rapidly.In order to reduce the environmental pollution of SF_6 exhaust gas in power industry,we designed a set of experimental platform based on the catalytic effect of TiO_2 surface under ultraviolet irradiation to study the effects of different amounts of TiO_2 and H_2O participation on the degradation of high concentrations of SF_6 at normal temperature and pressure.At the same time,the process of catalytic decomposition of SF_6 gas molecule on TiO_2 surface was analyzed by simulation.The results show that TiO_2,as a catalyst,can effectively increase the degradation rate of SF_6.The degradation rate of SF_6 after ultraviolet irradiation for 3 hours in the absence of TiO_2 was only 1.25% and the degradation rate reached 8.98% with 8 pieces of TiO_2 added,and the main degradation products were SO_2F_2,SiF_4,SF_4,and SO_2.Besides,H_2O addition in SF_6 gas can increase the degradation rate to 27.22%.The main degradation products are SO_2F_2,SiF_4,SF_4,SiH_4,HF,and SO_2.The simulation calculation results show that the TiO_2 catalytic degradation of SF_6 is to subdivide the required energy into several small energy absorption processes which explains the advantages of TiO_2 catalytic degradation of SF_6 from the perspective of energy absorption.The study can provide a reference for the degradation of SF_6.