1. Cryopreservation method (1) The fresh Flammulina velutipes after normal temperature preservation and harvesting are immediately put into baskets and baskets. It is covered with multi-layer wet gauze or plastic film, placed in a cool place (natural temperature below 20 °C), generally can be kept fresh for 1-2 days. (2) After cryopreservation after simple packaging, the newly harvested enoki mushrooms are sorted and packed with low-density polyethylene film bags (DpE) with a film thickness of 20 mm, vacuum sealed, and the packaging bags are erected into special baskets or cartons. Inside, chilled at 1-3°C. It can be kept fresh for 13 days. 2. The chemical preservation method adopts safe and non-toxic chemicals for humans and animals and is used for soaking or spraying on the surface of mushroom to achieve the purpose of prolonging the freshness of mushroom. The chemicals that can be used to keep the mushroom fresh include: sodium metabisulfite, sodium chloride, dilute hydrochloric acid, high concentration of carbon dioxide, preservatives, ascorbic acid, etc. (1) Spraying fresh sodium metabisulfite The 0.02% sodium metabisulfite solution is used to rinse the needle mushroom to remove sediment debris, and then soaked in 0.05% sodium metabisulfite solution for 10 minutes to protect the color. After removing and draining, the plastic bags can be stored for several days. (2) Preservation of sodium chloride (ie salt) and calcium chloride solution with 0.2% salt solution plus 0.1% calcium chloride to make a mixed soaking solution. Soaking the newly harvested needle mushroom to soak the above mixture requires the mushroom body. Immerse in the liquid for 30 minutes, remove and drain the plastic bag, and keep it fresh for several days.