Pediatric diarrheal disease occurs most often in infants and children under 3 years of age, with a high incidence from 6 months to 2 years of age, and is one of the main causes of pediatric malnutrition and growth disorders. The principle of treatment of diarrhea is to prevent dehydration, correct dehydration, continue to eat and drink, and use reasonable medication. 1, prevent dehydration: diarrhea leads to a large amount of water and electrolyte loss. Therefore, as soon as the child begins to have diarrhea, the child should be given enough fluids orally and continue to feed the child to prevent dehydration. The following methods can be used: (1) oral rehydration salts (ORS): after each diarrhea, under 2 years of age oral 50~100ml, 2~10 years of age 100~200ml, more than 10 years of age can drink as much as you can give. It can also be given at 40~60ml/kg, which is taken at the beginning of diarrhea. (2) Rice soup with salt solution: 500ml of rice soup + 1.75g of fine salt or 25g of fried rice flour + 1.75g of fine salt + 500ml of water and cook for 2~3 minutes. The dosage is 20~40ml/kg, finished in 4 hours, and then orally at any time, give as much as you can drink. (3) Sugar and salt water: 500ml of plain water + 10g of sucrose + 1.75g of fine salt, the dosage is the same as rice soup with salt solution. 2, correct dehydration: pediatric diarrhea dehydration, most can be corrected by oral rehydration therapy. Severe dehydration requires intravenous rehydration. 3, dietary treatment: mild diarrhea of children for breastfeeding, continue to breastfeed, appropriate restrictions on the number of breastfeeding or shorten the duration of each breastfeeding, suspend the complementary food; artificial feeding children can be fed with an equal amount of rice soup or diluted milk or other milk substitutes, by rice soup, porridge, noodles, etc. gradually over to the normal diet. For lactose intolerant children, add lactase enzyme when feeding, or be de-lactose diet. Allergic diarrhea, consider protein allergy, can be changed to hydrolyzed milk powder or amino acid milk powder. During the period of diarrhea, eat light and easy to digest, as far as possible, do not “fasting”, fasting can lead to delayed symptoms, nutrition loss. 4, drug treatment: (1) pathogenic treatment: non-infectious diarrhea generally do not need antibacterial drugs. However, systemic bacterial infections and invasive bacterial infections caused by diarrhea, must be given appropriate systemic anti-infective treatment. Antibiotics can be used without antibiotics for general watery stools, and antibiotics can be used for mucous stools and pus and blood stools, with a full course of treatment, which cannot be stopped without doctor’s consent. (2) Micro-ecological therapy: through restoring the micro-ecological balance of human intestinal tract, it can achieve the purpose of treating intestinal diseases. (3) Adjuvant therapy: intestinal mucosal protective agents (such as hexagonal montmorillonite), intestinal dynamics inhibitors, antisecretory drugs and so on. (4) Zinc supplementation therapy: WHO recommends oral zinc supplementation for children with diarrhea while continuing oral rehydration salts therapy, which can enhance immune function and prevent recurrence.