Trapa natans is a family of Trapa. Also known as water chestnut, water chestnut and water chestnut, it is sweet, cool and non-toxic. It is the fruit of an annual herbaceous aquatic plant, water chestnut. Its skin is crisp and fleshy, and it can be eaten after being cooked and peeled, and it can also be eaten in porridge. Water chestnut is rich in protein, unsaturated fatty acids, vitamins and trace elements. It has the effects of promoting diuresis, promoting lactation, quenching thirst and relieving alcoholism.