The temperature range of 150℃ to 200℃ can fully heat chestnut and achieve the best frying effect. Too low temperature leads to undercooked chestnut, while too high temperature leads to over-fried chestnut. If the temperature is too high, chestnut will be fried and lose its taste and flavor. Sugar-fried chestnuts need a certain temperature to melt the sugar and cover the chestnuts. Excessive temperature will lead to rapid discoloration and gelatinization of sugar. At the temperature of 150℃ to 200℃, chestnut can absorb heat evenly and gradually mature.