Cinnamon bark will not grow back after peeling, people usually cut off the branches to peel cinnamon bark, and will leave the main trunk to continue to grow branches, so as to continue to peel cinnamon bark. The most common types of cinnamon are geranium cinnamon, cinnamon, and Sichuan cinnamon. Cinnamon bark in the geranium bark, bark for the cylinder or uneven pieces, size varies, generally 30-60 cm long, 2-4 mm thick. The outer bark is gray-brown, densely populated with small inconspicuous lenticels or gray-white spots; the inner surface is reddish brown or gray-red, and the inner surface is smooth, with inconspicuous fine longitudinal lines, and will show oil marks when scratched with a hard object. The texture is hard and brittle, easy to be broken, and the cross-section is not neat. The gas is fragrant and cool slightly like camphor, slightly sweet and pungent flavor.

Yin Xiang, stem skin is grooved or flaky, about 3 mm thick. Outer surface into brownish gray, and the outer surface and geranium bark compared to the rough, with round raised lenticels and gray-white patches of clothing, the outer skin partially scraped and now concave lenticel marks; inner surface brown, smooth. The inner surface is brown and smooth. The texture is firm, and the inner layer is lobed in section. Smell fragrant, taste a little sweet and astringent. The Sichuan cinnamon bark is also irregular pieces, 1-3 mm thick. The outer skin color is brown or brown, and the outer skin is very rough, lenticels point-like or oval-shaped protruding on the surface, some Sichuan cinnamon bark has gray-brown spots; Sichuan cinnamon bark inner surface color is gray-brown. The texture is hard, and the cross-section color is light brown. The aroma is weak, slightly camphoraceous, and the flavor is pungent, cool and slightly spicy. Geranium cinnamon, born in evergreen broad-leaved forests. Distributed in Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Taiwan. 2, Yin Xiang, born in open forests, dense forests or thickets, or streamside roadsides, etc., 100-1400 meters above sea level (in Yunnan, the altitude can be as high as 2100 meters). Distributed in Guangdong, Guangxi, Yunnan and Fujian. 3, Chuan Gui, born in valleys, mountain slopes in the forest. Distributed in Shaanxi Qinling south, Jiangxi, south-central, Sichuan, Guizhou.