Longan (Dimocarpus Longan) is a plant of sapindaceae. Its seeds contain starch. After proper treatment, longan can be used to make wine. The wood is solid, dark red brown and resistant to water and humidity. It is good for shipbuilding, furniture and fine workmanship. The seed coat is rich in vitamins and phosphorus, which is beneficial to spleen and brain. The fresh longan fruit is dried and becomes the longan pulp in Chinese medicine. Longan pulp is extremely rich in vitamin C and potassium. In addition, it also contains a large amount of magnesium and copper, for the treatment of body deficiency, insomnia, forgetfulness, remarkable effect.