Water chestnut, also known as water chestnut, wind chestnut, black chestnut, water chestnut, water chestnut, water chestnut and water chestnut, is an annual aquatic herb of Trapa. Originated in Europe, southern China, especially in Taihu Lake area and Pearl River Delta in the lower reaches of the Yangtze River. Water chestnut meat contains 24% starch, 3.6% protein and 0.5% fat. When young, you can eat it raw as fruit. When cooked, it can be cooked or processed into water chestnut powder. When it is air-dried, it can be stored to extend the supply. Water chestnut leaves can be used as green feed or green manure. Helps strengthen the stomach, stop dysentery and fight cancer. Helps to treat gastric ulcer, dysentery, esophageal cancer, breast cancer and cervical cancer. External use of rhombic handle to treat multiple warts of skin; The burnt ash of rhombic shell is used for external treatment of pustulosis and hemorrhoids.