When a child’s body temperature is below 35℃ after a high fever, parents should keep the child warm and replenish water appropriately. When a child’s body temperature is lower than 35 degrees Celsius after a high fever, it is generally due to increased sweating during the fever, and the water in the child’s body decreases when the water evaporates. Parents are advised to keep their children warm when their body temperature is too low, and to increase clothing appropriately to avoid letting them get cold. Parents also need to give the child appropriate supplemental water, mainly warm water, should not drink cold water. Children with high fever after the body temperature is lower than 35 ℃ parents should take timely measures to regulate, if the body temperature continues to be lower than 35 ℃, parents should take the child to the doctor in a timely manner, in accordance with the doctor’s advice to take treatment, to avoid a life-threatening situation.