Pediatric rehydration principles are as follows: 1, follow the principle of salt before sugar, as children appear dehydrated, to carry out timely rehydration treatment, rehydration should first be used saline treatment. The reason is that only salt water can have tension and reach the child’s blood vessels in order not to be discharged as soon as possible, while the use of sugar water children will soon be discharged through urine, can not achieve the purpose of effective replenishment of fluids. 2, see urine to replenish potassium, if the child does not urinate in the case of caution to replenish potassium, because the child urine volume is relatively small, if potassium replenishment, will lead to the child’s hyperkalemia. Severe hyperkalemia can lead to cardiac arrest and even fatalities in children. 3. follow the principle of rehydration as needed. if the child’s rehydration is corrected in a satisfactory manner, the remaining fluids in the child can be added according to the situation, not necessarily mechanically, but flexibly according to the situation.