Fresh chestnuts can be put into the freezer of the refrigerator and frozen after shelling, but they should not be kept for too long, because they may go bad if kept for too long. It is recommended to eat them in time. The vacuum-packed chestnuts sold in supermarkets do not contain preservatives, and the function of vacuum-packed chestnuts is to prevent contamination by miscellaneous bacteria. In order to prevent the growth of bacteria and the deterioration of chestnut, vacuum packaging was used. Of course, there may be some merchants to prevent chestnut people from deteriorating and let it have a longer shelf life.