五倍子是瘿绵蚜科的多种倍蚜分别寄生在盐肤木、红麸杨、青麸杨叶上所致虫瘿的总称。其中盐肤木上产结的角倍、倍蛋含单宁60—65%,红麸杨、青麸杨上产结的枣铁倍、蛋铁倍和肚倍含单宁65—70%。这些是中国五倍子的主要倍种。五倍子提炼的单宁酸及二次加工的倍酸、焦倍酸是现代医药、纺织印染、稀有金属提炼、石油钻探和脱硫、制革、电子、食品等工业的重要原料。因我国是其主要产区,故国际市场上有“中国五倍”之誉,从清代到现在,我国五倍子 Galla galium is a variety of Aphididae aphids were parasitic in the salt skin wood, red bran, green bran leaf caused by the general term for gall. Including the angle of the wood on the knot Kok times, double egg white with tannin 60-65%, red bran Yang, green bran Yang Zuodujian yield on the end of the egg iron times and belly fold containing 65-70% tannin. These are the main species of Chinese gallnut. Gallic acid extracted tannin and secondary processing of acid, acid is the focus of modern medicine, textile printing and dyeing, rare metal extraction, oil drilling and desulfurization, leather, electronics, food and other industries an important raw material. Because of our country is its main producing areas, so the international market has “China five times ” reputation, from the Qing Dynasty to the present, China’s gall