Aspirin has been proven to have a preventive effect against cerebral infarction by a large amount of evidence-based medical data. The effective preventive dose is 100 mg (1 tablet) once a day. The mechanism of action of aspirin is the irreversible inhibition of cyclooxygenase synthesis, which in turn inhibits the production of platelet thromboxane A2, thereby inhibiting platelet aggregation. Aspirin is widely used in the treatment of ischemic cardiovascular and cerebrovascular diseases, such as cerebral infarction, transient ischemic attack, as well as ischemic heart disease, such as coronary heart disease, angina pectoris and myocardial infarction. During the application of aspirin, it is necessary to pay attention to whether there is a bleeding tendency, and if bleeding, ecchymosis and other parts of the skin and mucous membrane occur during the application, it is necessary to stop the use of aspirin and monitor the function of platelets in a timely manner.