Children ate a rapid antipyretic medicine an hour without fever can be seen in the observation time is not enough, the use of antipyretic dose is not enough, intervention needs to be analyzed according to the cause, such as considerations for the observation time is not enough to continue to closely observe, no special treatment. 1. Insufficient observation time: at present, the commonly used antipyretic drugs for children are ibuprofen and acetaminophen, and there is no rapid antipyretic drug. Generally, for febrile children, the body temperature can gradually decrease 0.5~1 hour after the use of antipyretic drugs, and some diseases in the acute stage can be used 2~3 hours after the use of which the body temperature can gradually decrease. The specific time needs to be assessed by the specialist, considering this factor does not require special treatment, close observation and continue to monitor the body temperature can be. 2. Insufficient dosage of antipyretic drugs: Usually, for children with fever, appropriate dosage of antipyretic drugs should be given according to their body weight. If the dosage of antipyretic drugs is insufficient, the above phenomenon may also occur, which needs to be evaluated by specialists, and supplemented with appropriate dosage of antipyretic drugs under the guidance of physicians. 3. Disease-related reasons: If the disease is in the acute stage or critical condition, the above phenomenon can occur, such as the acute stage of influenza children, for the use of antipyretic drugs for one hour, the body temperature has not dropped, need to continue to observe, and need to actively treat the cause, such as oral oseltamivir phosphate. It is recommended to consult a specialist for evaluation and analysis and reasonable intervention.