Watermelon can be called "the king of summer", which is cool and refreshing, sweet and juicy, and is a good fruit in summer. Watermelon contains a lot of glucose, malic acid, fructose, protein amino acids, lycopene and rich vitamin C, except fat and cholesterol. It is a kind of food with high nutrition, high purity and safe eating. The sugar content of pulp is generally 5 ~ 12%, including glucose, fructose and sucrose. The sweetness increased with the increase of sucrose in the late mature stage. The sugar, protein and trace salt contained in watermelon can reduce blood fat and soften blood vessels, and it is also effective in treating cardiovascular diseases, such as hypertension. Watermelon frost is made of watermelon peel and seed shell, and can be used for treating aphtha, oral carbuncle, dental carbuncle and acute pharyngolaryngitis. Watermelon peel, pulp and seeds can be eaten and used medicinally.

Watermelon pulp:

The volatile components include protein, glucose, sucrose, fructose, malic acid, citrulline, glutamic acid, arginine, phosphoric acid, lysine, propionic acid, ethylene glycol, betaine, adenine, sucrose, carotene, tomato hydrocarbon, hexahydrotomato hydrocarbon, vitamins A, B and C and various aldehydes. Watermelon pulp contains citrulline and arginine, which can increase the formation of urea in rat liver and lead to diuresis. It has the effects of clearing away heat, relieving summer-heat, quenching thirst, promoting diuresis, and relieving alcoholic toxicity, and can be used for treating various heat, summer-heat polydipsia, dysuria, sore throat, oral inflammation, and drunkenness.

Watermelon seeds:

Contains fatty oil, protein, vitamin B2, starch, pentosan, propionic acid, urea, sucrose, etc. Has the effects of clearing away lung heat and moistening lung, regulating middle warmer, quenching thirst and promoting digestion, and can be used for treating hematemesis and chronic cough. Seed shells are used to treat blood and dysentery caused by intestinal wind. Seeds contain a soap-like ingredient, which has the functions of lowering blood pressure and relieving acute cystitis.

Seed kernel (embryo):

It has the functions of clearing away lung-heat, moistening intestine, regulating middle energizer and quenching thirst, and is an important drug for treating stagnation of intestine, stomach and spleen.

Watermelon peel:

Guapi, called "watermelon Cui Yi" in Chinese medicine, has the functions of clearing away heat and relieving summer-heat, purging fire and relieving restlessness, and lowering blood pressure, and has certain curative effects on anemia, dry throat, cleft lip, cystitis, liver ascites and nephritis. In addition, because watermelon skin is rich in vitamins C and E, it can be used to wipe the skin, or it can be mashed and applied to the skin. After being treated with 10 ~ 15 minutes, it can be washed with water, and has the functions of nourishing, rejuvenating, beautifying and preventing furuncle. Fresh watermelon peel can be used as a side dish after pickling.