Children vomiting diarrhea after pneumonia, may be due to acute gastroenteritis, can cooperate with the doctor to choose antidiarrheal treatment, anti-infective treatment, microbial agents and other ways to regulate. 1. Antidiarrheal treatment: Montelukast can adsorb intestinal toxins and protect the intestinal mucosa, reduce the frequency of diarrhea, and prevent the phenomenon of dehydration in children. 2. anti-infection treatment: pediatric pneumonia vomiting diarrhea, consider and infection factors, in the viral infection, usually do not need special treatment, will have a certain self-limiting. However, in bacterial infection, antibacterial drugs such as cefixime and cefdinir need to be selected according to drug sensitivity. 3. Microbial agents: intestinal probiotics composed of special active microbial agents, beneficial to human health, can be used to treat diarrhea, especially watery diarrhea caused by viral infections, commonly used drugs, including Bifidobacterium bifidum, Saccharomyces boulardii, and so on. It is recommended that children with vomiting and diarrhea seek medical attention in time to avoid adverse effects. The above medications should be used in accordance with medical advice.