The present invention provides a garlic and shallot preservation method, which is to prepare a packaging bag, and place the garlic or shallot into the receiving space and sealing. The garlic or shallot will consume oxygen under respiration effect and continuously generate carbon dioxide fully filled in the receiving space, so that the amount of oxygen contained in the receiving space is relatively reduced. When the air pressure of the receiving space is greater than the of that outside the packaging bag due to filling with carbon dioxide, the oversaturated carbon dioxide will be exhausted to the outside of the packaging bag through an unidirectional ventilating valve, so as to compose the present invention.一種蒜頭、蔥頭保存方法,備妥包裝袋且將蒜頭或蔥頭放入包裝袋之容置空間內且密封,待蒜頭或蔥頭在呼吸作用下耗氧且不斷生成二氧化碳充滿在容置空間內,令容置空間內的含氧量相對減少,且當容置空間內因充滿二氧化碳而氣壓大於包裝袋外的氣壓時,過飽之二氧化碳可由單向透氣閥排出包裝袋外,藉此構成本發明。1‧‧‧包裝袋11‧‧‧容置空間12‧‧‧單向透氣閥2‧‧‧蒜頭3‧‧‧乾燥物
