The patients with acute myocardial infarction (AMI) present high mortality and morbidity rate, and also have malignant prognosis even if they could survive. The mortality and prognosis has been improved markedly because of the treatment with primary percutaneous coronary intervention (PPCI). However, the issue of no-reflow after revascularization has not been solved yet. The mechanisms of no-reflow in human being were regarded mainly as micro-embolism in coronary micro-circulation with thrombus or debris from atherosclerotic plaque, coronary micro-vasculature spasm and other conditions.