The cinnamic aldehyde is also one of important medicine raw materials. Commonly used in external use medicine, synthetic drugs. Because it has the promotion blood circulation, causes the skin to return warm, tightly the skin organization, the external use may cause the four limbs, the body in the massage to be happy, may have the full improvement to the moisture content detention's phenomenon, has the very strong steatolysis function. To skin's scar, the fibroma conditioning and the elimination all have the effect. Disperses the extravasated blood. Has the anti-zymoplasm effect, has, the analgesia, to allay a fever calmly, functions and so on anti-convulsion; The cinnamic aldehyde has the expansion blood vessel, lowers the bottom blood pressure the function.