Apple polyphenols widely exsit in fruits and vegetables. The polyphenol content differs according to maturity rate. Young apple has 10 times content comparing with mature apple. Therefore, it is better to use young apple to get the apple polyphenols. Crude apple polyphenols contain chlorogenic acid, catechins, epicatechin, apple condensed tannins, phlorizin, phloretin, anthocyanin and etc.