Children’s diarrhea like water may be caused by viral enteritis, food poisoning, lactose intolerance and other diseases, which need to be treated symptomatically and causally. Some of the mild symptoms can be self-cured. 1.Symptomatic treatment: need to follow the doctor’s instructions to apply montelukast, loperamide, difenocoumarol and other antidiarrheal drugs, has the effect of astringency, protection of the intestinal tract. Usually also accompanied by abdominal pain in children need to follow the doctor’s instructions to apply scopolamine and other antispasmodic agents. 2. Treatment of the cause: (1) for viral enteritis and food poisoning, need to follow the doctor’s prescription oral rehydration salts, can prevent and control dehydration. Food poisoning also need to follow the doctor’s instructions to apply amoxicillin, cefixime and other antibiotics. For allergies, antihistamines such as loratadine (caution for children younger than 2 years old) should be used as prescribed by the doctor. For children with mild viral enteritis and food poisoning, the disease can be relieved within a short period of time, and there is a certain degree of self-healing. (2) For lactose intolerance, children need to follow the doctor’s instructions to apply probiotic preparations such as bifidobacteria and lactobacillus. Children need to avoid dietary lactose intake, pay more attention to rest. When children have diarrhea like water, they need to go to the hospital in time, and cooperate with the doctor to actively treat the primary disease.