Oral rehydration salts are most widely used in the standardized oral rehydration salts Ⅲ, and a bag of oral rehydration salts needs to be filled with 250 ml of water. When using the measuring cup as a container, the rehydration salts will be poured into all at once, adding about 40 degrees of lukewarm water is appropriate, the water level added to the 250 ml mark of the measuring cup, stirring evenly for a period of time can be. Care needs to be taken to avoid splitting the oral rehydration salts into half bags to flush 125 mL, which will affect the accuracy of the concentration of the solution. Liquids such as fruit juices or drinks should not be mixed into the prepared solution as this may affect the rehydration effect. Mild diarrhea usually improves gradually with rehydration, and oral rehydration solution should be given in small amounts and many times. If dehydration is prevented, a small amount of oral rehydration salts should be given quickly after diarrhea, usually no more than 50 ml for infants less than 6 months of age; 100 ml for infants 6 months to 2 years of age; 150 ml for infants 2 to 10 years of age; and the amount of rehydration can be increased appropriately for children over 10 years of age. Oral rehydration salts III has a low osmolality, can quickly replenish electrolytes and water, and can reduce the amount of feces and the number of times the patient vomits, reducing the occurrence of hypernatremia, the clinical efficacy of the treatment of acute diarrhea and dehydration is better. Patients with mild or moderate diarrhea can take oral rehydration salts under the guidance of a doctor or pharmacist. In contrast, patients with severe diarrhea or severe dehydration should be treated with intravenous fluids until the diarrhea stops or the dehydration is corrected.