Water chestnut is one of China's specialty vegetables, usually underground bulb for food, can be raw, cooked or cooking, especially for canned food, called "water horseshoe", is one of the main ingredients of the restaurant; and can extract starch, and lotus root and diamond powder called starch three kui, cold and slippery, sweet and cool flavor, can benefit the gas in the middle of the peace. At the same time, the tubular leafy stems on the ground have the effect of quenching thirst and quenching fever.