Cerebellar atrophy is commonly seen in the elderly and is often a disease that cannot be cured. There are many causes of microcephaly, which can also cause harm to patients. A common cause 1, genetic factors: is a common cause of cerebellar atrophy, the family has people suffering from this disease, the offspring have a greater chance of possibly suffering from this disease; 2, cerebrovascular disease: is also a common cause of cerebellar atrophy, such as cerebral hemorrhage, cerebral infarction, etc. will lead to the patient’s brain parenchyma because of extrusion necrosis, or ischemia and hypoxia leading to brain atrophy or even necrosis; 3, poisoning: such as carbon monoxide poisoning leading to brain ischemia and hypoxia, drug poisoning, overdose of sodium phenytoin leads to drug poisoning, there is alcohol poisoning caused by cerebral vasoconstriction, reduced blood flow, cortical hypoxia, a long time will cause cerebellar atrophy; 4, inflammation: patients with acute cerebellitis, after the treatment of sequelae of the situation; 5, neurodegeneration: such as multi-system atrophy cerebellar type, the patient’s cerebellar volume atrophy becomes smaller. Second, the harm 1, eye movement disorders: patients will appear convergence reflex disorder, the phenomenon of doll’s eye, also called doll’s eye. At the same time, the extraocular muscles are impaired and the patient has blurred vision and double vision. 2. cerebellar dysarthria: the patient will have dysphonia, slow speech, monotone pronunciation, nasal voice, etc., because the muscles controlling the movement of the lips, tongue and throat are ataxic. 3. motor ataxia: the patient has unstable standing and cannot maintain balance. When walking, the gait is unstable, staggering, swaying from side to side as if drunk, with both upper limbs in a flexed forward posture, or when doing certain movements, the movements do not match the distance, and there is an obvious tremor when approaching the target.