Paralysis refers to a disease that causes complete or partial loss of motor function of the lower limbs of the body after the occurrence of sensory disorders, and the loss of random movements, and the sudden paralysis of the lower limbs of both limbs is a kind of paralysis. Where the cortical motor projection area and the upper motor neuron pathway is damaged by lesions, can cause upper motor neuron paralysis, common causes are craniocerebral trauma, tumor, inflammation, cerebrovascular disease, degeneration, poisoning, and some internal diseases, such as diabetes mellitus, hematoporphyria, macrocytic anemia and vitamin B12 deficiency. The same as the lesion damage to different parts of the clinic can produce different types of paralysis, such as monoparalysis, hemiplegia, paraplegia, quadriplegia (sudden paralysis of both lower limbs), etc., although the performance of the paralysis is different, but they have the same characteristics, that is, paralyzed muscle tension increases, tendon reflex hyperreflexes, superficial reflexes disappeared, the emergence of the so-called cascade (joint) movement and pathological reflexes, paralyzed muscles do not atrophy, electrical test no degenerative reaction. The patient has no degenerative response to electrical tests. Patients with central paralysis of the lower limbs should limit the intake of salt in their diet, eat a light diet, and eat more fresh vegetables, fruits, soy products and seaweed. Keep the skin clean and dry, pay attention to heat preservation, pay attention to the temperature of water when cleaning, and take good care of urine and feces. Actively prevent bedsores. Regularly massage the muscles of the legs to prevent the appearance of muscle atrophy.