Decoction, anciently known as decoction liquid, is one of the most ancient dosage forms of Chinese medicine and is also the most widely used in clinical application of traditional Chinese medicine, which has been prosperous for thousands of years. In addition to the inseparable relationship with China's history, culture and customs, it constantly absorbs modern science and technology to make its own characteristics better utilized. Decoction can fully meet the needs of syndrome differentiation and treatment in traditional Chinese medicine, and has several characteristics such as quick efficacy, easy absorption and strong effect.