Children in the process of general anesthesia is generally not particularly harmful to the body, but need to pay attention to the anesthesia time. The child by standardized general anesthesia operation is generally not harmful to the body. After general anesthesia may appear some adverse reactions, such as gastrointestinal reaction, insufficient ventilation, hypoxemia and so on. 1. gastrointestinal reaction: nausea, vomiting and other gastrointestinal reactions, when the drug metabolism, basically can be eliminated. 2. Inadequate ventilation: mainly manifested as CO2 retention, which may be accompanied by hypoxemia. Insufficient ventilation occurs during anesthesia, mainly due to central and peripheral respiratory depression produced by anesthetics, anesthetic analgesics and muscle relaxants. 3. Hypotension: It can be caused by deep anesthesia, excessive intraoperative blood loss, reflex blood pressure drop when pulling internal organs during surgery, and can be accompanied by bradycardia and other manifestations. It is recommended that children strictly follow the instructions of the medical staff after surgery to avoid the occurrence of adverse events.