1. Hypertension: It is the most important and independent risk factor for stroke. Blood pressure is positively correlated with the risk of cerebral hemorrhage or cerebral infarction, and controlling hypertension can significantly reduce the incidence of stroke. 2, heart disease: such as heart valve disease, non-rheumatic atrial fibrillation, coronary artery disease and various causes of heart failure can increase the incidence of TIA, stroke (especially ischemic). Diabetes mellitus is an important risk factor for stroke. The likelihood of stroke in patients with abnormal glucose tolerance or diabetes mellitus can increase exponentially compared to the general population. 4, TIA is also a risk factor for stroke, about 20% of patients with cerebral infarction have a history of TIA, and the annual incidence of stroke in patients with TIA is 1%-15%. 5. Smoking and alcohol abuse are both important risk factors for stroke. The risk of stroke is related to the amount and duration of smoking. The incidence of stroke in alcoholics is four to five times higher than in the general population, especially the risk of hemorrhagic stroke. 6, hyperlipidemia: can increase blood viscosity and accelerate the occurrence of cerebral atherosclerosis. 7, other stroke risk factors: such as diet (high intake of salt and meat, animal oil, etc.), overweight, drug abuse, oral contraceptives, blood disorders and abnormal blood rheology. There are also such as advanced age, gender, race, climate and family history of stroke.