Cerebral infarction is also known as cerebral infarction, and patients with cerebral infarction often suffer from low potassium in the later stages of the disease, so potassium supplementation is necessary. Cerebral infarction is a common cerebrovascular disease, which refers to ischemic necrosis or softening of limited brain tissues caused by ischemia and hypoxia due to impaired blood circulation in the brain. Patients often have symptoms such as speech impairment, dysphagia, hemiparesis, sensory impairment, nausea and vomiting. When patients with cerebral infarction suffer from nausea and vomiting, it can lead to hypokalemia; due to dysphagia and low diet, it can also lead to hypokalemia; when combined with hypertension, if diuretic drugs are included in the oral antihypertensive drugs, it can also lead to hypokalemia; when combined with diabetes mellitus, due to drinking and urinating, it can lead to high loss of potassium, it can also lead to hypokalemia, therefore, it is necessary to replenish potassium for treatment. In patients with cerebral infarction, electrolytes should be checked regularly, and if low potassium is present, potassium supplementation should be required in time.