Spastic hemiplegic gait is a common abnormal gait disease, which can occur in the sequelae of cerebrovascular disease, encephalitis, traumatic brain injury, etc. It can also occur in the corticospinal tract lesions, and what are the specific causes, which are introduced below: Stroke Stroke is a group of diseases characterized by local neurological deficits due to impaired blood circulation in the brain. It includes diseases of intracranial and extracranial arteries, veins and venous sinuses, but arterial diseases are more common. Acute hemiplegia in infant and childhood Acute hemiplegia in infant and childhood is now called cerebral artery thrombosis, a group of clinical syndromes that are now mostly named after their pathology, i.e., cerebral artery thrombosis. Since the site of cerebral artery thrombosis mostly involves the blood supply of the pyramidal bundle, acute hemiparesis is the most important clinical symptom. The pathogenesis is mainly due to inadequate cerebral blood perfusion involving the function of one of the pyramidal tracts. Pediatric acute hemiparesis can be seen in a variety of disorders that can cause occlusive cerebral artery lesions. In addition to acute hemiparesis, it may be accompanied by convulsions, impaired consciousness, and increased intracranial pressure. Hemiplegia, also known as hemiplegia, is a common symptom of acute cerebrovascular disease, which refers to impaired movement of the upper and lower extremities, facial and lower tongue muscles. Although patients with mild hemiplegia can still move, they tend to walk with the upper limb flexed and the lower limb straightened, and the paralyzed lower limb walks in a half circle with one step. In severe cases, the patient is often bedridden and loses the ability to live. According to the degree of hemiplegia, it can be divided into mild paralysis, incomplete paralysis and total paralysis. Mild palsy: it is characterized by reduced muscle strength, with muscle strength at level 4-5, which usually does not affect daily life; incomplete palsy is heavier than mild palsy, with a larger range and muscle strength at level 2-4; total palsy: muscle strength at level 0-1, with the paralyzed limb completely unable to move.