Cold water should be added to the second decoction of Chinese medicine as in the first, so as to facilitate the precipitation of the active ingredients of the medicine. Chinese medicine should be decocted for the second time with cold water just like the first time. If the second time to add is hot water, boiling faster, then compared to the first time its decoction time is not long enough, which is not conducive to the precipitation of the active ingredients of the drug, the efficacy of the drug will have a certain impact. So in the second decoction should be added cold water, and the amount of water should be slightly more than the first time, so as to completely decoct the efficacy of the medicine. There are many precautions for the decoction of Chinese medicine, and it is necessary to add cold water to the second decoction to avoid affecting the efficacy of the medicine. For patients who are not clear about how to decoct the medicine, it is recommended to ask the doctor about the relevant precautions during the consultation, or you can choose the method of decocting by the hospital on behalf of the patient.