Introduction: commonly known as horseshoe, also known as chestnut, it is named after its shape like horseshoe and chestnut. Calling it a horseshoe only refers to its appearance; It is like chestnut, not only in shape, but also in taste, composition and function, and because it bears fruit in mud, it is called chestnut. Water chestnut skin is purple and black, the meat is white, the taste is sweet and juicy, crisp and delicious. It has the reputation of underground Sydney since ancient times, and northerners regard it as Jiangnan ginseng. Water chestnut can be regarded as both fruit and vegetable, and it is a popular seasonal product. Efficacy: Water chestnut contains the highest phosphorus among root vegetables, which can promote human growth and maintain physiological functions, and is of great benefit to the development of teeth and bones. At the same time, it can promote the metabolism of sugar, fat and protein in the body and adjust the acid-base balance. Therefore, water chestnut is suitable for children to eat. In the study of water chestnut in Britain, an impatient antibacterial ingredient-water chestnut English was found. This substance has a certain inhibitory effect on Staphylococcus aureus, Escherichia coli, Bacilli producing bacteria and Pseudomonas aeruginosa, and also has a certain effect on lowering blood pressure. This substance also has preventive and therapeutic effects on cancers of the lungs, esophagus and breast. Water chestnut also has the function of preventing acute infectious diseases. Water chestnut is a good disease-preventing food in the spring show when measles and epidemic meningitis are more likely to occur. Water chestnut is a cold food, which has a good effect of clearing away heat and purging fire. It can not only clear away heat and promote fluid production, but also supplement nutrition, and is most suitable for patients with fever. It has the effects of cooling blood and detoxicating, promoting diuresis and relaxing bowels, eliminating dampness and eliminating phlegm, promoting digestion and relieving bloating. Suitable for people: it is popular food. Children and patients with fever are best to eat. Application amount: about 10 each time.