In general, the concentration and efficacy of Chinese medicine will be weakened after boiling three times, and it is not recommended that Chinese medicine be boiled three times. However, if the amount of medicine is relatively large, in the case of not affecting the efficacy of the medicine, can be boiled three times. Under normal circumstances, in the first decoction of Chinese medicine, due to the existence of osmotic pressure balance, the active ingredients of the drug precipitation is limited. Therefore, it is necessary to re-add water for the second decoction, which is conducive to the full precipitation of the active ingredients, and the efficacy of the juice is also stronger. The third decoction of Chinese medicine, the concentration of the juice is low, the efficacy will be greatly weakened. Therefore, it is generally recommended that the Chinese medicine be boiled twice. It should be noted that if the amount of medicine is large, the number of times of decoction can be increased appropriately, and three times is also possible. In addition, the specific number of times and methods of decoction of traditional Chinese medicine should consult a doctor or pharmacist, do not blindly decoct on their own.