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Based on the experience of GIS equipment maintenance,the causes of air leakage defects of GIS equipment running in a 330 substation were analyzed.After the equipment was disassembled,the main causes of air leakage were found,and a series of improvement measures were taken to eliminate the GIS equipment leakage defect.And the effective and feasible advice was put forward for this type of air leakage problem.The results lay a foundation for the safe and stable operation of GIS equipment.