1. Dried mushrooms don't have any moisture, so in order to preserve dried mushrooms for a long time, it is necessary to ensure that dried mushrooms are dry. Once there is water, many microorganisms begin to move, and dried mushrooms are hard to preserve.

2. Store the dried mushrooms in some sealed environment, such as tying the bag mouth tightly or covering the bottle cap to prevent moisture from entering.

3. After dried mushrooms are stored for a period of time, some moisture may enter when eating. You can put them in the sun every once in a while, which can remove water and kill some bacteria. It is also good for preserving dried mushrooms.