1. Sand preservation method: find an open space, dig a pit and bury chestnuts to be stored in sand, layer by layer, until the last layer is covered with sand.

2. Hanging preservation method: put the chestnuts to be preserved in a large pot, pour clean water, clean them, put them in a dustpan, dry them in a ventilated place for 1~2 days, and dry the water. Then prepare a ventilated fishing net bag or cloth bag, put the dried chestnuts in it, tie a slipknot, and then hang it in a cool and ventilated place.

3. Refrigeration method: Pour a proper amount of edible salt and water into a large bowl, and melt the salt with chopsticks. Then pour the chestnuts that need to be preserved, grab them and wash them, and then soak them in salt water for 5 minutes. Salt water can play a role in disinfection and sterilization. Time is up. Take chestnuts out of the water, put them in a dustpan and put them in a ventilated place to dry the water. Then put the dried chestnuts into a fresh-keeping bag, squeeze out all the air in the bag, seal it, and finally put it in the refrigerator for refrigeration.