 1. History of intracranial hemorrhage 2. Stroke secondary to cardiogenic embolism 3. Serious damage of motorial function, dementia 4. Serious complications or co morbidityuncontrolled accelerated type of hypertension, BP180120mmHg, diabetic acidosis, heart failure, renal failure, hepatocirrhosis, malignant tumor 5. Contraindication of Cilostazol and Aspirin 6. Patients who need co medication of other antiplatelet agents, anticoagulants or fibrinolytic drugs 7. Active peptic ulcer 8. Pregnancy or breast feeding 9. Judged to be inappropriate to enter the study by investigators. - 