Abstract: In recent years,under the background that the traditional insulating medium SF₆ endangers the atmospheric environment and aggravates the global warming effect because of its high global warming potential and atmospheric life,searching for environmental-friendly alternative gases of SF₆ is one of the research hotspots.In virtue of its excellent insulation performance and low global warming potential,C₅F₁₀O has the potential to replace SF₆ in the gas insulated closed switchgear.Under the influence of partial overheating fault in GIS,whether the insulation ability of decomposed C₅F₁₀O can self-recover is an important factor to determine its application prospects.At present,there are few studies on the recovery of decomposed C₅F₁₀O by overheating.In this paper,we established an over thermal and product detecting experiment platform,conducted series of experiments to imitate decomposition and restoration of C₅F₁₀O.The experimental results show that it has a certain self-recovery ability in the temperature range of 400℃-475℃.Then we optimized the molecular structure of C₅F₁₀O and its main decomposition products by using Hybrid:B3LYP method and analyzed the reaction pathways by CF₃CFCOCF₃-、CF₃-、（CF₃）₂CFCO-radicals and C₃F₆.Moreover,we compared the effect of temperature on the probability of recovery reaction with the main decomposition reaction of C₅F₁₀O under the same conditions.The self-recovery characteristics of C₅F₁₀O were revealed in the molecular level,which laid a foundation for the industrial application of it.