Orange peel, belonging to the citrus genus of the Rutaceae family .Distributed in Hubei, Hunan, Jiangxi, Guizhou, Yunnan, Sichuan and other places, containing volatile oil 1. 5% (pressing method) to 2% (distillation method), the main component in the oil is D-limonene, which also contains β- Laurylene（ β- Myrcene) α- and β- Pinene and other flavonoids, as well as hesperidin, neohesperidin, tangerine (5,6,7,8,4 '- pentamethoxyflavone), dihydrocitrinin (5,6,7,8,3', 4 '- hexamethoxyflavanone), and 5-O-demethyl citrinin; It is also reported that the content of hesperidin in Chuanchenpi is about 8.4%, and the content of nobilitin in Chuanchenpi is about 0. 15%, also containing 0.28% -2% of synephrine (for hydroxyapatite). 54%. Dual use of medicine and food.