The timely application of intravenous thrombolytic therapy in patients with ischemic stroke can greatly reduce the mortality and disability rates. However, intravenous thrombolytic therapy must be administered within 3-6 hours of stroke onset to have the desired effect. The earlier the treatment is received, the greater the chance of complete recovery. However, in practice most stroke patients arrive at the hospital more than 6 hours later, making thrombolytic therapy difficult and risky. Cerebral hemorrhagic stroke is also more effective the earlier it is diagnosed and the earlier it is treated. Therefore, it is important to identify whether it is a stroke in time. First, ask the patient to smile or say three short, coherent sentences; second, raise both arms three times in a row and hold them up for some time; third, start walking three steps. If the patient has difficulty smiling or speaking incoherently; if he or she has difficulty raising the upper limbs; if he or she has difficulty starting to walk or if he or she is dragging his or her feet, it indicates the possibility of a stroke. This test is simple and easy to perform, even if not a doctor, an ordinary bystander can correctly identify, so it is easily accepted by the public, thus greatly improving the recognition rate of stroke. A bystander who is a relative of the patient is more able to correctly identify whether the patient has a smile and changes in speech, further improving the correctness of identifying changes in facial muscle strength, and if there is also a typical hemiplegia it is a sign of stroke. If any of the above simple tests occurs, call an ambulance immediately and send the patient to a neurological hospital or to a hospital with a National Health and Family Planning Commission Stroke Risk Screening and Prevention Base.