Orange peel is the peel of the sweet orange of the Rutaceae plant. Sweet orange is an evergreen small tree, cultivated in hills, low mountains and along the banks of rivers and lakes. It is cultivated all over the south of the Yangtze River in my country, with many varieties. In winter or early spring, peeled off the peel, sun-dried or dried. Orange peel is a dry outer peel, often peeled into several petals, connected at the base or in irregular fragments. About 1 to 4 mm thick, the outer surface is orange-yellow or reddish-brown, relatively smooth, with fine wrinkles and concave point-like oil chambers; the inner surface is yellow-white, rough, spongy, with yellow-white or yellow-brown tendons. Vascular bundles. Hard and brittle, fragrant, slightly bitter in taste. The soup is fresh in color, oily, soft in texture, strong in spicy aroma, slightly sweet in taste and bitter in taste.