When patients with cerebral palsy are put under general anesthesia, there may be problems like difficult endotracheal intubation caused by deviation of respiratory tract due to scoliosis, hypotension related to chronic malnutrition and anemia, and failure of ventilation due to deformation of the thoracic cavity. The main clinical problem of postanesthetic complication is hypoxemia. The patients with cerebral palsy need close monitoring during treatment under general anesthesia and postanesthetic management. The purpose of this report is to evaluate a patient with cerebral palsy and mental retardation appeared to have dyspnea after general anesthesia.