(1) Sensory indicators The color of chestnut is light yellow or golden yellow, and the color is consistent. Sugar water allows a little turbidity and a small amount of pulp crumbs. The taste and smell are the same as those of sugar water chestnuts, and there is no peculiar smell. The shape and tissue of chestnut were shelled and endothelium removed, and the whole chestnut was basically the same size. This organization is soft and hard. (2) The physical and chemical index is 5 15g, and the allowable tolerance is 3%. But the average weight of each batch is not lower than the net weight. The solid content shall not be less than 55% of the net weight. When the can is opened, the sugar water concentration reaches 14% ~ 18%, or according to customer requirements. The content of heavy metals per kilogram of products shall not exceed the following values: tin ≤ 200mg, copper ≤ 10mg and lead ≤ 1mg. (3) Microbial indicators have no signs of corruption caused by pathogenic bacteria and microbial action.