(1) Meeting diagnostic criteria of ischemic stroke; (2) Meeting large-artery atherosclerosis or small-artery occlusion subtypes of ischemic stroke according to TOAST (The Trial of Org 10172 in Acute Stroke Treatment) classification [29]; (3) In the first 2 weeks of the first onset should account for no less than 50% of all the included cases; (4) 38-80 years of age; (5) Willing to respond truthfully and timely to researcher queries after recruitment, able to cooperate with data and sample collection during follow-ups; (6) Willing to sign informed consent.