Astringency is a symptomatic measure, in clinical practice, every need to combine the root cause of the treatment, in order to get twice the result with half the effort, such as the use of oyster powder to treat self-perspiration to replenish qi and strengthen the surface and astringent antiperspiration at the same time, with the treatment of the belt under the Weixi pill to do dampness and astringency stop the belt at the same time, are all examples. In addition, astringents more or less have the effect of astringency, for the syndrome of evil spirit, do not use, misuse can lead to the disadvantage of astringency. This is the most important point to note. Therefore, it is not advisable to use astringents for symptoms such as self-perspiration and dysentery in the wet zone, and this is the reason. Written in 1694 by Wang Ang of the Qing Dynasty, the book contains more than 300 prescriptions commonly used in traditional Chinese medicine, which are divided into 20 categories, such as tonic, publication, attack, and vomiting. It is summarized and summarized in the form of a seven-word song. It is known as the most classic of Chinese medicine prescription songs!