Humidity is very important for wine storage. Excessively high air humidity will lead to mouldy and rotted cork and then wine leakage. One of the consequences of wine leakage is that overmuch air entering into the bottle results in rapid oxidation of wine and breeding of microorganism. The existence of multiple microorganisms will give rise to rapid deterioration of wine quality. Excessively low air humidity will bring about contraction liability of cork in dry environment, and oxidation due to entered air, accelerating wine ageing. Hence, the optimal humidity for wine bottle storage is 70%-75%.