It has been known that liraglutide reduces infarct size, improved left ventricular function, reduce myocardial stunning, and play a protective role in myocardial ischemia-reperfusion injury for patients with acute myocardial infarction. But it is not sure whether liraglutide can benefit patients with ischemic cardiomyopathy. This study aim to explore the effect of Liraglutide in improving cardiac function for patients with ischemic cardiomyopathy.