Dried longan generally refers to longan meat, the benefit is to tonify the heart and spleen, etc., but the effect of soaking water to drink is limited; the bad side is not yet clear. It should be used in accordance with medical advice. Longan meat is a kind of sweet taste and warm nature, attributed to the heart meridian, spleen meridian of Chinese medicine. It has the effect of tranquilizing the mind and nourishing blood, tonifying the heart and spleen. It is used for qi and blood deficiency, blood deficiency and yellowing, forgetfulness and insomnia, palpitation and panic. Longan meat in water is limited in effective dose, it is difficult to achieve therapeutic effect. Generally decocted soup for internal use, or made into a paste, soaked in wine, or made into pills, powder. The Pharmacopoeia and related literature do not specify the adverse reactions of longan meat. Longan meat should be used with caution for those with phlegm fire (dry mouth and lips, irritable heat and chest pain, and phlegm that is difficult to expel), or those with dampness and fullness (tightness in the chest and epigastrium, drowsiness in the limbs, nausea and vomiting, etc.), so as not to aggravate the condition. If the patient is not feeling well, it is recommended to consult a doctor in time, and the medicine should be used under the guidance of the doctor’s diagnosis.