The main reason is that rotavirus enters the intestine through the mouth, causing damage to the intestinal mucosa and inflammatory cell infiltration in children, resulting in an increase in the number of stools, watery stools or egg-flour-like stools. Treatment methods are as follows: 1. Ensure the child’s water intake and food intake to prevent dehydration, electrolyte disorders and malnutrition, and if necessary, give a compound electrolyte oral solution to replenish electrolytes. 2. Give intestinal mucosal protective agents, such as montelukast. 3. Bifidobacteria and lactobacilli can be given without antiviral treatment.