According to the health preserving theory of TCM, watermelon is cold and sweet, and has the functions of quenching thirst, relieving summer heat, relieving vexation and relieving sore throat, relieving hangover and clearing heat, inducing diuresis to stop dysentery, stimulating appetite, promoting metabolism and nourishing the body. In recent years, watermelon has been found to have the effect of lowering blood pressure. In addition, it also has a certain curative effect on sore throat and aphtha caused by dry climate in autumn and winter. Watermelon peel has the functions of clearing away heat and relieving summer-heat, detoxicating, purging fire and relieving annoyance, and eliminating dampness and diuresis, and is suitable for symptoms such as summer heat, polydipsia and dysuria. Watermelon kernel has the functions of clearing away lung heat, moistening intestines, resolving phlegm and helping digestion. Watermelon has diuretic effect. "Half a melon on a hot day, no need to catch medicine." Watermelon has been an ideal natural nutritional health care product since ancient times. In summer, when people work, travel and swim in the open air, they are prone to heatstroke due to the sun. If you can eat some watermelons in time, you can prevent heatstroke. Sugar, salt and nicotinic acid contained in watermelon can improve nephritis. Therefore, those patients with nephritis and cystitis with early inflammation and mild illness are likely to be cured if they eat watermelon in time. Watermelon is also a sacred product in beauty beauty. For people who have a strong liver fire and are prone to acne, acne, blisters or bad breath, eating more watermelon can reduce the fire, and annoying bad breath or bad skin will be improved. Massage the face or hands and feet with watermelon skin has a cosmetic effect.