Abstract: In the power industry, various outdoor enclosures face the problem of condensation inside the enclosure. In response to this phenomenon, the causes of condensation are analyzed, and experimental methods of controlling variables and remote real-time monitoring are used to explore the effects of different sealing structures and breathable valves on water vapor interception on outdoor enclosures. Research has found that different sealing structures and breathable valves on outdoor enclosures have similar interception effects on water vapor, but there is a significant difference in interception speed. Regarding the time difference caused by interception speed, it has good reference significance for whether to adopt anti condensation measures or what kind of anti condensation measures to adopt for protection in the future.