From the perspective of health care and medicine, it is reflected in the following aspects: (1). Health care and dietotherapy of Changshan Huyou: According to Compendium of Materia Medica, "Pomelo (taste) is sour, cold and non-toxic, and has the functions of resolving food stagnation, relieving alcoholism, treating bad breath caused by drinking, removing intestines and stomach, and treating anorexia during pregnancy". Changshan Huyou is a natural hybrid with pomelo as the female parent, which well retains this medicinal function of pomelo. The effects of Huyou, such as relieving cough, eliminating phlegm, clearing away heat and toxic materials, relieving hangover and refreshing, have always been adopted by pomelo farmers in producing areas. Suffering from a cold and cough, especially the sad dry cough or excessive phlegm of infants and young children, you can steam grapefruit fruit with rock sugar and take it orally several times to recover. Excessive smoking often leads to excessive phlegm, sore throat, nausea or toothache. If you can eat more fresh fruit, juice or preserved fruit of huyou, you can eliminate or alleviate the above discomfort. Excessive drinking often leads to dizziness, dizziness, vomiting and gastrointestinal discomfort. If you can eat fresh grapefruit, you can sober up, eliminate the stomach and feel comfortable. The newly developed new drugs "Jiuban" and "Huyou Loquat Zhike Dew" in Changshan County, which use Huyou as raw material to treat upper respiratory tract infection and acute and chronic bronchitis, have been tried out and have a good response. In addition, eating fresh fruit of huyou will not cause the blood sugar of diabetic patients to increase; It has the effect of lowering blood pressure for patients with hypertension; It has laxative effect on constipation patients. (2) Health components in the fruit of Huyou: Bitter substances Bitter substances include limonoids and naringin, among which limonoids are higher in sweet oranges and wide-peel oranges, and naringin mainly exists in pomelo. Huyou may come from the hybrid of pomelo, mandarin orange and mandarin orange, so the content of these two bitter substances is high. Limonin compounds have many health functions: ① anticancer effect; ② Analgesic and anti-inflammatory effects. ③ Anti-anxiety and sedation; ④ Regulating the cholesterol level in the body to prevent atherosclerosis. The hypolipidemic effect of grapefruit may be related to limonin and other substances. Naringin has anti-inflammatory and antiviral effects, and is one of the main effective components of citrus Chinese herbal medicines such as Fructus Aurantii. The types and contents of bitter substances in Huyou juice are shown in Table 4. Table 4 Types and Contents of Bitter Substances in Huyou Juice Types of Bitter Substances (ppm) Limonin (ppm) Neohesperidin (ppm) Huyou Juice11.23400.0124.0 (determined by the Storage and Processing Laboratory of Citrus Research Institute, Chinese Academy of Agricultural Sciences) Carotenoids are fat-soluble pigments. Carotenoids are also bioactive substances with antioxidant, anti-aging, anti-cancer, enhancing human immunity, and reducing the occurrence of cardiovascular diseases and eye diseases. However, as one of its parents, the carotenoid content in the peel of Huyou is low (Table 5). Table 5 Carotenoid Content of Huyou Fruit (μg/g FW) Leaf Lutein (μg/g FW) Zeaxanthin (μg/g FW) β -cryptoxanthin (μ g/g FW) Flesh 0.93 1.030.05 Peel 4.4 12.420. Third, the development of health care and medicinal value 1. It has great potential economic value to develop health food or medicine by using the pharmacological components of huyou fruit, such as naringin and limonin. From the perspective of nutrition and health care, the existing products were further processed in the following aspects: (1) The unique nutrition and health care factors of the existing deep-processed products, especially vitamin C, carotenoids and some phytochemicals, were studied. (2) According to the different people targeted by the product, some nutrients, especially vitamins and minerals, which are suitable for the product and easy to be lacked by the people can be strengthened. (3) Adding some unique plant compounds of Huyou to increase the health care function of its products. 2. Extract effective components from processed pomelo peel and pomelo seeds, and develop health care products and pharmaceutical intermediates: pomelo peel and pomelo seeds are rich in plant compounds such as flavonoids, terpenoids and limonin. And dietary fiber were used to extract functional components from the peel and seeds of Huyou. These effective components can be used to develop health food with the functions of lowering blood sugar, regulating blood lipid, improving human immune function, losing weight and caring skin, and resisting oxidation and aging. Further extraction of some plant compounds, especially limonin and naringin, can produce pharmaceutical intermediates with antitumor, hypolipidemic and antiviral effects.