Apple boiled water has a certain role in promoting intestinal astringency, can assist in the treatment of diarrhea. For functional diarrhea caused by indigestion, drinking apple water appropriately has a certain anti-diarrhea effect, but not all causes of diarrhea have a role. If the diarrhea symptoms are more serious, or need to take oral probiotics at the same time, such as bifidobacteria, lactobacillus tablets and so on. At the same time, pay attention to oral rehydration salts to maintain the balance of water and electrolytes, and pay attention to dietary modification. If it is due to bacterial infection or viral infection caused by infectious diarrhea, drinking boiled water with apples has no therapeutic effect, and needs to be given targeted anti-infective or anti-viral treatment, which is useful.