Cinnamon contains 1% ~ 2% of volatile oil, tannins, mucus, carbohydrates and so on. The main components in the oil are about 85% cinnamaldehyde and cinnamyl acetate, and a small amount of benzaldehyde, cinnamic acid, salicylic acid, benzoic acid, vanillin, phenyllactone acetate, etc. Cinnamaldehyde is an effective component of Cinnamomum cassia, which has analgesic, sedative and antipyretic effects.