The clinical manifestations of poliomyelitis, its symptoms are manifested in three periods.1. The first is the prodromal period, the main symptoms are fever, loss of appetite, excessive sweating, irritability and generalized sensory hypersensitivity, also can be seen nausea, vomiting, headache, sore throat, constipation, diarrhea and so on, usually lasts for 1-4 days. The second stage is the pre-paralytic stage, most patients enter this stage from the prodromal stage, and a few enter this stage with another fever a few days after the disappearance of the prodromal symptoms. The child will have high fever and headache, pain in the neck, back and limbs, aggravated by movement or change of position. At the same time, there is excessive sweating, reddening of the skin, irritability and other excited states and positive meningeal irritation sign and other neurological signs. The third stage is the paralytic stage, which cannot be clinically separated from the pre-paralytic stage. Generally, 2-7 days after the onset of the disease, or 1-2 days after the second fever, there is this asymmetric muscle weakness or flaccid paralysis, which is aggravated with the fever, and the paralysis no longer progresses after the fever subsides, and dysfunction is rare. Depending on the site of the lesion, it can be subdivided into the following types: the first type is the spinal cord type. The spinal cord type is the most common, showing flaccid paralysis, asymmetry, loss of tendon reflexes, and hypotonia, with the lower limbs and large muscles being more likely to be affected than the upper limbs and small muscles. The lower limbs and large muscle groups are more likely to be affected than the upper limbs and small muscle groups. However, only a single muscle group may be affected, or all limbs may be paralyzed. The second type is the inflammatory medullary type. Inflammatory medullary type is the result of invasion of the motor nerves of the cranial nerves and the respiratory and circulatory centers of the inflammatory medulla. The third type is the cerebral type, which is relatively rare and is characterized by high fever, restlessness, convulsions, or lethargy and coma. The fourth type is the mixed type, in which the above types coexist in the presentation. The fourth stage is the recovery period, usually 1-2 weeks after paralysis, the paralysis begins to recover from the distal part of the limb and lasts for several weeks to months. The fifth stage is the sequela stage. In severe cases, atrophy of the affected muscles occurs and nerve function cannot be restored, resulting in deformity of the affected limb.