Water chestnut is an aquatic plant, strictly speaking, it belongs to a shallow perennial herb, and its bulbs are used as vegetables. Water chestnut tastes sweet and cold, and has the effects of clearing away heat and resolving phlegm, stimulating appetite and promoting digestion, promoting fluid production and moistening dryness, improving eyesight and sobering up. Clinically, it is suitable for the treatment of yin deficiency and lung dryness, cough with excessive phlegm, polydipsia, constipation, drunkenness and lethargy. In the epidemic season of respiratory infectious diseases, eating water chestnut is beneficial to the prevention and treatment of meningitis, measles, whooping cough and acute pharyngitis.