Walnut kernel contains many trace elements and minerals such as protein, calcium, phosphorus and iron, and many vitamins such as carotene and riboflavin. The main component of fat in walnut is linoleic acid glyceride, which will not only increase cholesterol after eating, but also reduce the absorption of cholesterol in intestine. Therefore, it can be used as a tonic for patients with hypertension and arteriosclerosis. In addition, these oils can also supply the needs of brain matrix. The trace elements zinc and manganese contained in walnuts are important components of pituitary gland. Regular eating is beneficial to the nutritional supplement of the brain and has the function of strengthening the brain and improving intelligence.