The fifth chapter of “Dream of the Red Chamber” mentioned the citron in Jia Yuanchun’s “Judgment”, and in the forty-first chapter it was written: “The big sister was holding a big grapefruit to play with, and suddenly she saw the boarder holding a Buddha’s hand, so she also wanted the Buddha’s hand.” In the seventy-second round, it is written that there is a kind of antique called “wax oil jelly of the Buddha’s hand”. The ” wax jelly ” is a kind of precious stone, belongs to the Zhejiang Qingtian stone a kind of, very rare and valuable. In the same book, Cao Xueqin mentioned two kinds of fruits, citron and Buddha’s hand. Later people often confuse these two fruits. Li Shizhen regarded citron, citron and bergamot as the same thing in the “Compendium of Materia Medica”. In the botanical name and reality map examination, also equated citron with buddha’s hand: “Song” Tujing Yong writes, citron grass-like, that is, buddha’s hand.” This is a very typical anecdote. Despite the fact that the author of the “Botanical Name and Facts Chart Exam” spent a lot of ink to explain how to recognize the Buddha’s hand, the result is still not clear about the name and reality of the Buddha’s hand. It is evident that some issues seem to be simple, but in reality they are not. We can’t blame Li Shizhen for being wrong. People often say the buddha’s hand is also known as golden buddha’s hand, buddha’s hand citrus. Its traits are similar to citrus, grapefruit and other fruits, and citron, lemon, etc. have a close relationship, for the Rutaceae, citrus genus Citrus var. Because the fruit is split at the top like a finger, flexing and stretching, the length is different, resembling the hand of Buddha, the form is beautiful and free, so the name Buddha’s hand. The Buddha’s Hand is native to India, the land of Buddhism, and was later introduced to China, mainly produced in Zhejiang, Guangdong, Fujian and Sichuan south of the Yangtze River. As an ornamental plant, Buddha’s Hand is cultivated in most parts of China. The outer skin of Buddha’s hand is yellow-green or orange-yellow, with wrinkles and oil spots. The flesh of the fruit is light yellowish-white, scattered with uneven linear or dotted vascular bundles, fragrant, slightly sweet and then bitter in taste. After ripening, the Buddha’s hand is golden yellow and oily, and the fragrance is rich and refreshing, which can be said to be good in color, fragrance and shape. The dried fruit is fragrant and not cracked, bronze in color when ripe, firm as wood, and easy to store for a long time. Buddha’s hand contains lemon oleoresin and traces of geranoside and hesperidin. Buddha’s hand alcohol extract has a significant inhibitory effect on intestinal smooth muscle, a significant antispasmodic effect on acetylcholine-induced duodenal spasm, dilates coronary vessels, increases blood flow in coronary arteries, slows heart rate and lowers blood pressure. Buddha’s hand is a commonly used Chinese medicine. Its whole body is a treasure, the root, stem, leaves, flowers and fruits can be used as medicine, pungent, bitter, sweet, warm, non-toxic, into the liver, spleen, stomach three meridians, has a variety of medicinal functions, such as regulating phlegm, stopping vomiting and eliminating bloating, soothing the liver and strengthening the spleen, and stomach, etc. It has obvious relief for bronchitis and asthma, and is effective for indigestion, chest and abdominal distention. There are quite a few folk remedies with Buddha’s hand as the main medicine, such as 10 grams of fresh Buddha’s hand, add 6 grams of ginger, decoct in water to remove the residue, add sugar and take warm, once a day, to treat damp phlegm cough. Fresh Buddha’s hand peel 1.5-3 grams, chewed with a little sugar to treat vomiting and vomiting. Through refining, honeying, maceration and preparation, Buddha’s hand is often processed into a variety of foods and beverages, such as preserved fruit, candied fruit, Buddha’s hand wine, Buddha’s hand tea, Buddha’s hand honey, and so on. Buddha’s hand can be planted in pots as an ornamental fruit tree. The potted Buddha’s hand is evergreen, the fruit is golden, symbolizing good luck, and it has traditionally enjoyed the reputation of “the fairy of fruits, the wonder of the world”, which is of great ornamental value. Its fruit shape is peculiar and beautiful, like the slender hand of Guanyin, or holding or stretching, a thousand postures, wonderfully interesting.